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How do I check whether a file exists without exceptions?
...s.path.isfile(fname)
if you need to be sure it's a file.
Starting with Python 3.4, the pathlib module offers an object-oriented approach (backported to pathlib2 in Python 2.7):
from pathlib import Path
my_file = Path("/path/to/file")
if my_file.is_file():
# file exists
To check a directo...
How to concatenate items in a list to a single string?
...rse operation is list.split(" "). Any idea if this is going to be added to Python's methods for lists?
– Wouter Thielen
Aug 23 '15 at 10:02
10
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How to prevent auto-closing of console after the execution of batch file
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Add cmd.exe as a new line below the code you want to execute:
c:\Python27\python D:\code\simple_http_server.py
cmd.exe
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Skipping Iterations in Python
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The real question: Is leavin out the 'g' in 'lookin' Pythonic?
– Mason Gardner
Jan 12 '17 at 18:22
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How to count the frequency of the elements in an unordered list?
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The python groupby creates new groups when the value it sees changes. In this case 1,1,1,2,1,1,1] would return [3,1,3]. If you expected [6,1] then just be sure to sort the data before using groupby.
– Evan
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How to print a linebreak in a python function?
I have a list of strings in my code;
8 Answers
8
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What is the most efficient way to store a list in the Django models?
Currently I have a lot of python objects in my code similar to the following:
12 Answers
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How do I call setattr() on the current module?
...ables when called in a function, and then it must be treated as R/O -- the Python online docs can be a bit confusing about this specific distinction).
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Python __call__ special method practical example
...torial function that contains a static variable (as that's not possible in Python).
class Factorial:
def __init__(self):
self.cache = {}
def __call__(self, n):
if n not in self.cache:
if n == 0:
self.cache[n] = 1
else:
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Which characters are valid/invalid in a JSON key name?
..., etc? The both json.org and the linked official/formal ECMA specification PDF seem to imply that yes, those are valid in JSON, even in their literal forms (not just in the \u four-hex-digits form).
– mtraceur
Jun 16 '16 at 13:13
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