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How do I write JSON data to a file?
...ry and not yet JSON-encoded. Write it like this for maximum compatibility (Python 2 and 3):
import json
with open('data.json', 'w') as f:
json.dump(data, f)
On a modern system (i.e. Python 3 and UTF-8 support), you can write a nicer file with
import json
with open('data.json', 'w', encoding=...
Why is IoC / DI not common in Python?
...able frameworks and Java EE. On the other hand, there are also lots of big Python web applications, but beside of Zope (which I've heard should be really horrible to code) IoC doesn't seem to be very common in the Python world. (Please name some examples if you think that I'm wrong).
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Thread Safety in Python's dictionary
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Python's built-in structures are thread-safe for single operations, but it can sometimes be hard to see where a statement really becomes multiple operations.
Your code should be safe. Keep in mind: a lock here will add almo...
How to print a percentage value in python?
...0%}".format(1./3)
33%
If you don't want integer division, you can import Python3's division from __future__:
>>> from __future__ import division
>>> 1 / 3
0.3333333333333333
# The above 33% example would could now be written without the explicit
# float conversion:
>>>...
Is python's sorted() function guaranteed to be stable?
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Isn't this what is expected in this case? Python is going to compare tuples through all elements by default, not just the first "primary" one. If you only want to sort on the first element, you can pass the key parameter explicitly.
– Matias Gri...
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd1 in position 2: ordinal not in range(128)
...o .decode() with the appropriate encoding, of course. If nothing is given, python assumes ASCII, which obviously fails on non-ASCII-characters.
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What's the scope of a variable initialized in an if statement?
I'm new to Python, so this is probably a simple scoping question. The following code in a Python file (module) is confusing me slightly:
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Insert an element at a specific index in a list and return the updated list
...'s the timeit comparison of all the answers with list of 1000 elements for Python 3.4.5:
Mine answer using sliced insertion - Fastest (3.08 µsec per loop)
mquadri$ python3 -m timeit -s "a = list(range(1000))" "b = a[:]; b[500:500] = [3]"
100000 loops, best of 3: 3.08 µsec per loop
ATOzTOA's a...
Is there a “do … until” in Python? [duplicate]
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There is no do-while loop in Python.
This is a similar construct, taken from the link above.
while True:
do_something()
if condition():
break
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NameError: global name 'unicode' is not defined - in Python 3
I am trying to use a Python package called bidi. In a module in this package (algorithm.py) there are some lines that give me error, although it is part of the package.
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