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Auto reloading python Flask app upon code changes
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or pyvenv in python3.5, flask run also works, since when you pip install flask, a flask executable file is also installed in the venv/bin/ folder.
– TonyTony
Jan 4 '17 at 14:00
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How to print a string in fixed width?
...t;5}' indicates the argument’s index passed to str.format().
Edit 2:
In python3 one could use also f-string:
sub_str='s'
for i in range(1,6):
s = sub_str*i
print(f'{s:>5}')
' s'
' ss'
' sss'
' ssss'
'sssss'
or:
for i in range(1,5):
s = sub_str*i
print(f'{s:&...
Getting the exception value in Python
...can add a exc_info=True to our logging function to not miss the error.
For python3, I think it's safe to use str(e).
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A Regex that will never be matched by anything
...r regarding timing, as I found the exact opposite measured with timeit and python3.
– nivk
Nov 4 '17 at 20:59
It's not...
Python import csv to list
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Update for Python3:
import csv
from pprint import pprint
with open('text.csv', newline='') as file:
reader = csv.reader(file)
res = list(map(tuple, reader))
pprint(res)
Output:
[('This is the first line', ' Line1'),
('Thi...
How do I make python wait for a pressed key?
...on 2, is to use raw_input():
raw_input("Press Enter to continue...")
In python3 it's just input()
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Removing all non-numeric characters from string in Python
...both strings and unicode objects in Python2, and both strings and bytes in Python3:
# python <3.0
def only_numerics(seq):
return filter(type(seq).isdigit, seq)
# python ≥3.0
def only_numerics(seq):
seq_type= type(seq)
return seq_type().join(filter(seq_type.isdigit, seq))
...
Get list from pandas DataFrame column headers
...posted so far, so I'll just leave this here.
Extended Iterable Unpacking (python3.5+): [*df] and Friends
Unpacking generalizations (PEP 448) have been introduced with Python 3.5. So, the following operations are all possible.
df = pd.DataFrame('x', columns=['A', 'B', 'C'], index=range(5))
df
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python multithreading wait till all threads finished
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In Python3, since Python 3.2 there is a new approach to reach the same result, that I personally prefer to the traditional thread creation/start/join, package concurrent.futures: https://docs.python.org/3/library/concurrent.futu...
Regex to check whether a string contains only numbers [duplicate]
...ct malformed octal, I should match valid hex and decide whether to include Python3/Java numbers like 123_456 or C++ 123'456. \d+ seems like a middle ground in the absence of more context like a specific programming or human language and was strongly suggested by the author's first attempt.
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