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request for backtracking output to say what the multiple dependencies causing conflicts are #9254

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brainwane opened this issue Dec 9, 2020 · 5 comments · Fixed by #10937
Closed

request for backtracking output to say what the multiple dependencies causing conflicts are #9254

brainwane opened this issue Dec 9, 2020 · 5 comments · Fixed by #10937
Labels
C: dependency resolution About choosing which dependencies to install C: error messages Improving error messages UX User experience related

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@brainwane
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I was conversing with @craigcalef (I believe) on Twitter who said:

pip resolution that used to take 10 seconds now runs days without completion.

Maybe change the "pip is looking at multiple versions" INFO message to tell me why pip feels the need to do it?

and

Its incredibly tedious to find which dependencies are causing backtracking. It'd be very helpful if the INFO backtracking message told you why its backtracking.

Craig, could you share a bit of sample output with us so we can look at it concretely and decide what to insert and where? Thanks.
@brainwane brainwane added UX User experience related C: new resolver C: error messages Improving error messages labels Dec 9, 2020
@brainwane brainwane changed the title request for backtracking output to be more informative request for backtracking output to say what the multiple dependencies causing conflicts are Dec 9, 2020
@brainwane
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Craig provided sample output:


INFO: pip is looking at multiple versions of REDACTEDPACKAGE to determine which version is compatible with other requirements. This could take a while.
Collecting REDACTEDPACKAGE
  Downloading REDACTEDPACKAGE-0.5.0-py3-none-any.whl (30 kB)
  Downloading REDACTEDPACKAGE-0.4.4-py3-none-any.whl (32 kB)
  Downloading REDACTEDPACKAGE-0.4.3-py3-none-any.whl (35 kB)
  Downloading REDACTEDPACKAGE-0.4.2.tar.gz (25 kB)
  Downloading REDACTEDPACKAGE-0.4.1.tar.gz (24 kB)
  Downloading REDACTEDPACKAGE-0.4.0.tar.gz (24 kB)
  Downloading REDACTEDPACKAGE-0.3.3.tar.gz (21 kB)
INFO: pip is looking at multiple versions of REDACTEDPACKAGE to determine which version is compatible with other requirements. This could take a while.
  Downloading REDACTEDPACKAGE-0.3.2.tar.gz (21 kB)
  Downloading REDACTEDPACKAGE-0.3.1.tar.gz (20 kB)
  Downloading REDACTEDPACKAGE-0.3.0.tar.gz (20 kB)
  Downloading REDACTEDPACKAGE-0.2.0.tar.gz (19 kB)
  Downloading REDACTEDPACKAGE-0.1.0.tar.gz (18 kB)
INFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtracking
INFO: pip is looking at multiple versions of markupsafe to determine which version is compatible with other requirements. This could take a while.

It sounds like @craigcalef would like the line "pip is looking at multiple versions of REDACTEDPACKAGE to determine which version is compatible with other requirements." to more specifically say what it's conflicting with.

@notatallshaw
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notatallshaw commented Dec 10, 2020 •
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A small comment here from testing #9203

I ran pip in verbose mode vs. non-verbose mode and it didn't seem to make a difference, here is a very small sample of the output I get:

Collecting setuptools>=34.0.0
  Using cached setuptools-51.0.0-py3-none-any.whl (785 kB)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
INFO: pip is looking at multiple versions of werkzeug to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of websocket-client to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of vertica-python to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of urllib3 to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of uritemplate to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of unicodecsv to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of tzlocal to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of typing-extensions to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of typing to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of typed-ast to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of traitlets to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of tqdm to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of tornado to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of toml to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of pure-sasl to determine which version is compatible with other requirements. This could take a while.
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
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Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
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Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
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INFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingINFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtrackingRequirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
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Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)
Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)

So I can see it's looking at setuptools 51.0.0, and I can see there is some conraint on google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all] and somehow it's also looking at multiple versions of werkzeug, websocket-client, vertica-python, urllib3, uritemplate, unicodecsv, tzlocal, typing-extensions, typing, typed-ast, traitlets, tqdm, tornado, toml, pure-sasl

But the logs don't tell me why it's repeating this line repeatedly:

Requirement already satisfied: setuptools>=34.0.0 in ...\lib\site-packages (from google-api-core<2dev,>=1.21.0->google-api-python-client<2.0.0,>=1.6.0->apache-airflow[all]) (51.0.0.post20201207)

Is there a specific requirement it's testing against? Is it checking different versions of the above multiple packages? And what exactly is the problem as it says "Requirment alread satisfied", surely that's a good thing? It's hard to know how to improve the contraints when I don't know what pip is getting tripped up on exactly.

@uranusjr
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That log line is omitted repeated only due to a quirk in pip’s existing code structure (that has nothing to do with the resolver), and does not mean anything particularly useful, unfortunately.

@TheKevJames TheKevJames mentioned this issue Dec 11, 2020
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@TheKevJames
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Hey folks -- created #9258 to potentially help address this, as I ran into something similar. Not sure if the user on Twitter ran into the same thing as me, but I found using the new resolver has led to a lot of hard-to-debug issues since it only pprints out the versioning conflicts once it finally gives up on backtracking. I added a new flag for selectively disabling that, which makes it much easier to get the conflict info immediately and fix it, especially for cases which are 100% incompatible but have a large amount of cases which need to be tried before the resolver realizes that.

@pradyunsg pradyunsg added C: dependency resolution About choosing which dependencies to install and removed C: new resolver labels Oct 12, 2021
This was referenced Dec 10, 2021
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astrojuanlu added a commit to astrojuanlu/pip that referenced this issue Mar 3, 2022
@astrojuanlu
Present found conflicts when discarding some criterion
f47bc88 
Fixes pypagh-9254.
Closes pypagh-10258.
See pypa#10258 (comment) for inspiration.
@astrojuanlu astrojuanlu mentioned this issue Mar 3, 2022
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@astrojuanlu
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Pursuing a simpler approach to fix this issue at #10937. I think the output now is much more informative. Folks are welcome to try it out and see if it helps debugging backtracking situations.

@pradyunsg pradyunsg mentioned this issue Mar 15, 2022
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astrojuanlu added a commit to astrojuanlu/pip that referenced this issue Feb 27, 2023
@astrojuanlu
Present found conflicts when discarding some criterion
7c82696 
Fixes pypagh-9254.
Closes pypagh-10258.
See pypa#10258 (comment) for inspiration.
astrojuanlu added a commit to astrojuanlu/pip that referenced this issue Mar 26, 2023
@astrojuanlu
Present found conflicts when discarding some criterion
6930066 
Fixes pypagh-9254.
Closes pypagh-10258.
See pypa#10258 (comment) for inspiration.
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C: dependency resolution About choosing which dependencies to install C: error messages Improving error messages UX User experience related
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@astrojuanlu @uranusjr @brainwane @pradyunsg @TheKevJames @notatallshaw