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Complex numbers usage in python [closed]
I'm a math newbie. Now I'm getting deeper into Python data types. I can't understand how to use a complex number. Please give me examples of usage of complex numbers in Python.
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Why doesn't calling a Python string method do anything unless you assign its output?
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This is because strings are immutable in Python.
Which means that X.replace("hello","goodbye") returns a copy of X with replacements made. Because of that you need replace this line:
X.replace("hello", "goodbye")
with this line:
X = X.replace("hello", "goodbye"...
How do I write a Python dictionary to a csv file? [duplicate]
...want to check out the with statement for opening files. It's not only more pythonic and readable but handles closing for you, even when exceptions occur.
Example with these changes made:
import csv
my_dict = {"test": 1, "testing": 2}
with open('mycsvfile.csv', 'wb') as f: # Just use 'w' mode in...
Calling filter returns [duplicate]
I am learning the concept of filters in Python. I am running a simple code like this.
2 Answers
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Python if-else short-hand [duplicate]
I want to do the following in python:
2 Answers
2
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How do I get the parent directory in Python?
Could someone tell me how to get the parent directory of a path in Python in a cross platform way. E.g.
19 Answers
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Is there a standardized method to swap two variables in Python?
In Python, I've seen two variable values swapped using this syntax:
7 Answers
7
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Programmatically generate video or animated GIF in Python?
... each frame but a fixed frame rate would be fine too. I'm doing this in wxPython, so I can render to a wxDC or I can save the images to files, like PNG. Is there a Python library that will allow me to create either a video (AVI, MPG, etc) or an animated GIF from these frames?
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Why does Python code run faster in a function?
This piece of code in Python runs in (Note: The timing is done with the time function in BASH in Linux.)
3 Answers
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Display number with leading zeros
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In Python 2 (and Python 3) you can do:
print "%02d" % (1,)
Basically % is like printf or sprintf (see docs).
For Python 3.+, the same behavior can also be achieved with format:
print("{:02d}".format(1))
For Python 3.6...