Learn Python! - https://lectures.quantecon.org/py/
Documentation - https://docs.python.org/3/tutorial/index.html
Time Complexity in Python - https://bit.ly/2rlovyG
Data Structure in Python - https://bit.ly/2QghIxN
pip3 list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 pip3 install -U --user
With is a context manager it's usually used to manage resource objects. Try/except catches exception in a block of code.
with is a loop. It's got nothing to do with exceptions. If you want to check for exceptions, you can do
try:
some requests code
except SomeError:
tell user about an exception.
Play around with invalid pages and find what kind of exceptions you get
Like ConnectionRefusedError
try:
code
except ConnectionRefusedError:
print('Your connection was refunded')
For files it's usually a good idea to use a with loop.
Depending on what you're doing, you might need to use both, neither or just one of them. Check the documentation for the function you're running.
When an 'r' or 'R' prefix is present, a character following a backslash is included in the string without change, and all backslashes are left in the string. For example, the string literal r"\n" consists of two characters: a backslash and a lowercase 'n'. String quotes can be escaped with a backslash, but the backslash remains in the string; for example, r""" is a valid string literal consisting of two characters: a backslash and a double quote; r"" is not a valid string literal (even a raw string cannot end in an odd number of backslashes). Specifically, a raw string cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.
O 'r' indica uma raw string, é uma string pura, o que você escrever será tratado como caractere normal. O '' que é um caractere de escape será impresso em uma raw string da mesma forma que qualquer outro caractere.