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What is memoization and how can I use it in Python?
I just started Python and I've got no idea what memoization is and how to use it. Also, may I have a simplified example?
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Python __str__ and lists
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Calling string on a python list calls the __repr__ method on each element inside. For some items, __str__ and __repr__ are the same. If you want that behavior, do:
def __str__(self):
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def __repr__(self):
return self.__str__()
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How do I specify new lines on Python, when writing on files?
...ge. (It's actually called linesep.)
Note: when writing to files using the Python API, do not use the os.linesep. Just use \n; Python automatically translates that to the proper newline character for your platform.
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Python: How would you save a simple settings/config file?
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Configuration files in python
There are several ways to do this depending on the file format required.
ConfigParser [.ini format]
I would use the standard configparser approach unless there were compelling reasons to use a different format.
Wri...
Python unittests in Jenkins?
How do you get Jenkins to execute python unittest cases?
Is it possible to JUnit style XML output from the builtin unittest package?
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What is the Python equivalent of static variables inside a function?
What is the idiomatic Python equivalent of this C/C++ code?
26 Answers
26
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Initializing a list to a known number of elements in Python [duplicate]
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This way of initializing a Python array is evil: a=[[]]*2; a[0].append('foo'); now inspect a[1], and you will be shocked. In contrast a=[[] for k in range(2)] works fine.
– Joachim W
Aug 12 '13 at 21:40
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Python import csv to list
...s the second line', 'Line2'), ('This is the third line', 'Line3')]
Old Python 2 answer, also using the csv module:
import csv
with open('file.csv', 'rb') as f:
reader = csv.reader(f)
your_list = list(reader)
print your_list
# [['This is the first line', 'Line1'],
# ['This is the secon...
What is the fastest way to check if a class has a function defined?
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It works in both Python 2 and Python 3
hasattr(connection, 'invert_opt')
hasattr returns True if connection object has a function invert_opt defined. Here is the documentation for you to graze
https://docs.python.org/2/library/functions.h...
How can I remove non-ASCII characters but leave periods and spaces using Python?
...XYZ
!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c
EDIT: On Python 3, filter will return an iterable. The correct way to obtain a string back would be:
''.join(filter(lambda x: x in printable, s))
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