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https://patch-diff.githubusercontent.com/dreamapplehappy/python3-tutorial#下面是学习的过程中遇到的一些问题以及解决方案
Writing a Python decorator that can be called as a function or a callablehttp://chase-seibert.github.io/blog/2013/12/17/python-decorator-optional-parameter.html
How to create a Python decorator that can be used either with or without parameters?https://stackoverflow.com/questions/653368/how-to-create-a-python-decorator-that-can-be-used-either-with-or-without-paramet
What does functools.wraps do?https://stackoverflow.com/questions/308999/what-does-functools-wraps-do
What do (lambda) function closures capture?https://stackoverflow.com/questions/2295290/what-do-lambda-function-closures-capture
Does Python have a ternary conditional operator?https://stackoverflow.com/questions/394809/does-python-have-a-ternary-conditional-operator
Python nonlocal statementhttps://stackoverflow.com/questions/1261875/python-nonlocal-statement
Best way to handle list.index(might-not-exist) in python?https://stackoverflow.com/questions/2132718/best-way-to-handle-list-indexmight-not-exist-in-python
Python index of item in list without error?https://stackoverflow.com/questions/13160564/python-index-of-item-in-list-without-error
Python variable declarationhttps://stackoverflow.com/questions/11007627/python-variable-declaration
Why are there no ++ and --​ operators in Python?https://stackoverflow.com/questions/3654830/why-are-there-no-and-operators-in-python
enumeratehttps://docs.python.org/3/library/functions.html#enumerate
How to Slice Lists/Arrays and Tuples in Pythonhttp://pythoncentral.io/how-to-slice-listsarrays-and-tuples-in-python/
Unpacking Argument Listshttps://docs.python.org/2/tutorial/controlflow.html#unpacking-argument-lists
Why does comparing strings in Python using either '==' or 'is' sometimes produce a different result?https://stackoverflow.com/questions/1504717/why-does-comparing-strings-in-python-using-either-or-is-sometimes-produce
String comparison in Python: is vs. == https://stackoverflow.com/questions/2988017/string-comparison-in-python-is-vs
关于格式化输出多个值http://www.python-course.eu/python3_formatted_output.php
关于数字的有限和无限问题https://stackoverflow.com/questions/5438745/python-nan-and-inf-values
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