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Elegant ways to support equivalence (“equality”) in Python classes
...(1)
n1 == n2 # False -- oops
So, Python by default uses the object identifiers for comparison operations:
id(n1) # 140400634555856
id(n2) # 140400634555920
Overriding the __eq__ function seems to solve the problem:
def __eq__(self, other):
"""Overrides the default implementation"""
if...
Accessing last x characters of a string in Bash
...ands to up to length characters of parameter starting at the character
specified by offset. If length is omitted, expands to the substring of parameter
starting at the character specified by offset. length and offset are arithmetic
expressions (see Shell Arithmetic). This is referred to as Substring...
Pandas conditional creation of a series/dataframe column
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If you only have two choices to select from:
df['color'] = np.where(df['Set']=='Z', 'green', 'red')
For example,
import pandas as pd
import numpy as np
df = pd.DataFrame({'Type':list('ABBC'), 'Set':list('ZZXY')})
df['col...
How to use if - else structure in a batch file?
I have a question about if - else structure in a batch file. Each command runs individually, but I couldn't use "if - else" blocks safely so these parts of my programme doesn't work. How can I do make these parts run? Thank you.
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Checking for the correct number of arguments
How do i check for the correct number of arguments (one argument). If somebody tries to invoke the script without passing in the correct number of arguments, and checking to make sure the command line argument actually exists and is a directory.
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Get difference between two lists
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Out[5]: set([1])
where you might expect/want it to equal set([1, 3]). If you do want set([1, 3]) as your answer, you'll need to use set([1, 2]).symmetric_difference(set([2, 3])).
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improv...
StringIO in Python3
...so you can end up with TypeErrors ( string argument expected, got 'bytes') if you make this change in isolation. You need to carefully distinguish btyes and str (unicode) in python 3.
– Andy Hayden
Apr 22 '15 at 3:13
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Python - Check If Word Is In A String
I'm working with Python v2, and I'm trying to find out if you can tell if a word is in a string.
11 Answers
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How to format a phone number with jQuery
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I've modified this to support 'change' events within input fields. jsfiddle.net/gUsUK
– Zach Shallbetter
May 29 '13 at 18:48
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The 3 different equals
What is the difference between = , == , and === ?
5 Answers
5
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