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How to create a tuple with only one element
... make them tuples. You have to add a comma after the string to indicate to python that it should be a tuple.
>>> type( ('a') )
<type 'str'>
>>> type( ('a',) )
<type 'tuple'>
To fix your example code, add commas here:
>>> a = [('a',), ('b',), ('c', 'd')]
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Fastest way to list all primes below N
...ning: timeit results may vary due to differences in hardware or
version of Python.
Below is a script which compares a number of implementations:
ambi_sieve_plain,
rwh_primes,
rwh_primes1,
rwh_primes2,
sieveOfAtkin,
sieveOfEratosthenes,
sundaram3,
sieve_wheel_30,
ambi_sieve (requires numpy)...
NPM - How to fix “No readme data”
...site, all have refreshed!
Wish to helps, thanks~
[One Chinese Teach]希望对您有帮助，谢谢~
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Add up a column of numbers at the Unix shell
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python3 -c"import os; print(sum(os.path.getsize(f) for f in open('files.txt').read().split()))"
Or if you just want to sum the numbers, pipe into:
python3 -c"import sys; print(sum(int(x) for x in sys.stdin))"
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How to empty a list?
... For a sound explanation of del, I'd refer to the docs: docs.python.org/reference/simple_stmts.html#the-del-statement
– fortran
Sep 9 '09 at 16:28
14
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csv.Error: iterator should return strings, not bytes
... best practices around it. I do that fairly consistently. If you're new to Python, and you get stuck in an interactive session with a file you can't do anything with, you would have appreciated my advice...
– Aaron Hall♦
Mar 9 '19 at 13:04
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Is arr.__len__() the preferred way to get the length of an array in Python?
In Python , is the following the only way to get the number of elements?
8 Answers
8
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Create a .csv file with values from a Python list
I am trying to create a .csv file with the values from a Python list. When I print the values in the list they are all unicode (?), i.e. they look something like this
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Which characters need to be escaped in HTML?
Are they the same as XML, perhaps plus the space one ( &nbsp; )?
4 Answers
4
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How do I enable standard copy paste for a TextView in Android?
...se textView.setTextIsSelectable(true) to make this work. It won't work via xml in that case.
– Praveen Singh
Nov 4 '17 at 19:20
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