Day 10 - Files - Create Read & Download

Author: codingforentrepreneurs

tutorial-reference/Day 10/Reference.md

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+In general, to create or retrieve a file on your local system you must use the `open` command. Open has a few different "modes" so let's go through them now.
+
+## 1 Create a file with the `w` mode
+`w` means write as in write-mode. First let's define a random path to a filename that does not yet exist.
+```python
+to_save_dir = "/path/to/save/in/"
+filename = "myfilename.txt"
+full_path = to_save_dir + filename
+```
+Now let's `open()` that path so we can save it.
+
+```python
+with open(full_path, 'w') as file_object:
+    file_object.write("Hello world")
+```
+
+If we don't want to use `with` we just have to explicitly `close` the `open` call.
+
+```python
+file_object = open(full_path, 'w')
+file_object.write("Hello World")
+file_object.save()
+```
+
+## 2 Open a file with the `r` mode
+`r` means write as in write-mode. First let's define a random path to a filename that already exists (we created it above).
+```python
+to_save_dir = "/path/to/save/in/"
+filename = "myfilename.txt"
+full_path = to_save_dir + filename
+```
+
+```python
+with open(full_path, 'r') as file_object:
+    contents = file_object.read()
+    print(contents)
+```
+
+If we don't want to use `with` we just have to explicitly `close` the `open` call.
+
+```python
+file_object = open(full_path, 'r')
+contents = file_object.read()
+print(contents)
+contents.close()
+```
+
+## 3 Download files
+
+```python
+def download_file(url, directory, fname=None):
+    if fname == None:
+        fname = os.path.basename(url)
+    dl_path = os.path.join(directory, fname)
+    with requests.get(url, stream=True) as r:
+        with open(dl_path, 'wb') as f:
+            shutil.copyfileobj(r.raw, f)
+    return new_dl_path
+```

tutorial-reference/Day 10/download_from_url.py

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+import os
+import requests
+import shutil
+from download_util import download_file
+THIS_FILE_PATH = os.path.abspath(__file__)
+BASE_DIR = os.path.dirname(THIS_FILE_PATH)
+DOWNLOADS_DIR = os.path.join(BASE_DIR, "downloads")
+os.makedirs(DOWNLOADS_DIR, exist_ok=True)
+
+downloaded_img_path = os.path.join(DOWNLOADS_DIR, '1.jpg')
+url = "https://upload.wikimedia.org/wikipedia/commons/thumb/d/db/Classic_view_of_a_cloudfree_Peyto_Lake%2C_Banff_National_Park%2C_Alberta%2C_Canada_%284110933448%29.jpg/330px-Classic_view_of_a_cloudfree_Peyto_Lake%2C_Banff_National_Park%2C_Alberta%2C_Canada_%284110933448%29.jpg"
+
+# a smallish item
+r = requests.get(url, stream=True)
+r.raise_for_status() # 200
+with open(downloaded_img_path, 'wb') as f:
+    f.write(r.content)
+
+
+# dl_filename = os.path.basename(url)
+# new_dl_path = os.path.join(DOWNLOADS_DIR, dl_filename)
+# with requests.get(url, stream=True) as r:
+#     with open(new_dl_path, 'wb') as file_obj:
+#         shutil.copyfileobj(r.raw, file_obj)
+
+
+download_file(url, DOWNLOADS_DIR)

tutorial-reference/Day 10/download_util.py

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+import os
+import requests
+import shutil
+
+def download_file(url, directory, fname=None):
+    if fname == None:
+        fname = os.path.basename(url)
+    dl_path = os.path.join(directory, fname)
+    with requests.get(url, stream=True) as r:
+        with open(dl_path, 'wb') as f:
+            shutil.copyfileobj(r.raw, f)
+    return new_dl_path
+
+
+
+def download_file_slower(url):
+    local_filename = url.split('/')[-1]
+    # NOTE the stream=True parameter below
+    with requests.get(url, stream=True) as r:
+        r.raise_for_status()
+        with open(local_filename, 'wb') as f:
+            for chunk in r.iter_content(chunk_size=8192): 
+                if chunk: # filter out keep-alive new chunks
+                    f.write(chunk)
+                    # f.flush()
+    return local_filename

tutorial-reference/Day 10/file_manager.py

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+import os
+
+this_file_path = os.path.abspath(__file__)
+# print(this_file_path)
+BASE_DIR = os.path.dirname(this_file_path)
+ENTIRE_PROJECT_DIR = os.path.dirname(BASE_DIR)
+# print(BASE_DIR, ENTIRE_PROJECT_DIR)
+
+email_txt = os.path.join(BASE_DIR, "templates", "email.txt")
+
+content = ""
+
+with open(email_txt, 'r') as f:
+    content = f.read()
+
+
+print(content.format(name='Justin'))

tutorial-reference/Day 10/hello-world.txt

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+Hello world again

tutorial-reference/Day 10/images/0.txt

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+Hello world

tutorial-reference/Day 10/images/1.txt

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+Hello world

tutorial-reference/Day 10/images/10.txt

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+Hello world

tutorial-reference/Day 10/images/11.txt

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+Hello world

tutorial-reference/Day 10/images/2.txt

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+Hello world

tutorial-reference/Day 10/images/3.txt

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+Hello world

tutorial-reference/Day 10/images/4.txt

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+Hello world

tutorial-reference/Day 10/images/5.txt

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+Hello world

tutorial-reference/Day 10/images/6.txt

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+Hello world

tutorial-reference/Day 10/images/7.txt

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+Hello world

tutorial-reference/Day 10/images/8.txt

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+Hello world

tutorial-reference/Day 10/images/9.txt

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+Hello world

tutorial-reference/Day 10/store_files.py

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+import os
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+files_dir = os.path.join(BASE_DIR, "images")
+
+# if not os.path.exists(files_dir):
+#     print("This is not a valid path")
+
+os.makedirs(files_dir, exist_ok=True)
+
+my_images = range(0, 12)
+
+for i in my_images:
+    fname = f"{i}.txt"
+    file_path = os.path.join(files_dir, fname)
+    if os.path.exists(file_path):
+        print(f"skipped {fname}")
+        continue
+    with open(file_path, 'w') as f:
+        f.write("Hello world")
+    

tutorial-reference/Day 10/templates/email.txt

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+Hello {name},
+
+How's it going?