681 questions
3
votes
2
answers
59
views
How to reduce verbosity of self-documenting expressions in Python f-strings?
This script:
import numpy as np
a = np.array([2, 3, 1, 9], dtype='i4')
print(a)
print(f'{a=}')
produces:
[2 3 1 9]
a=array([2, 3, 1, 9], dtype=int32)
Is there a way to get just a=[2 3 1 9] from {a=}...
- 8,235
2
votes
1
answer
77
views
Convert numpy float to string
import numpy as np
number = np.float32(0.12345678)
assert str(number) == "0.12345678"
assert f"{number}" == "0.12345678359270096"
Why is this different when converting ...
- 86
1
vote
1
answer
47
views
Snakemake expand a string saved in a variable
My question is very simple, but I can't find how to do it in the Snakemake documentation.
Let's say I have a very long string to expand, like :
rule all:
input:
expand("sim_files/test_nGen{ngen}...
- 131
2
votes
3
answers
79
views
Combine Python f-string with printf style formatting?
I need to format a command line where some parameters come from simple variables, and others are the result of a longer expression. Python f-strings work well for the variables, and I'm using a printf-...
- 916
0
votes
4
answers
95
views
f string vs .format in manipulating a file name
I am trying to manipulate a file name to remove an underscore.
final_name = '{0}{1}{2}_{4}_new'.format(*filename.split('_'))
The filename is something like - 2024_10_10_091530_xyz_new.txt and the ...
- 21
0
votes
2
answers
155
views
Pycharm keeps saying there is an unmatched [ in an f-string, but it is matched
for a class I'm trying to write a python program. One of the lines tries to use an f string to report the value of a key ('cost') inside of a dictionary ('espresso') that is inside another dictionary ...
- 103
14
votes
4
answers
2k
views
Why do I need another pair of curly braces when using a variable in a format specifier in Python f-strings?
I'm learning how Python f-strings handle formatting and came across this syntax:
a = 5.123
b = 2.456
width = 10
result = f"The result is {(a + b):<{width}.2f}end"
print(result)
This ...
- 182
0
votes
3
answers
164
views
Python f-string equivalent of iterable unpacking by print instruction
print can nicely unpack a tuple removing brackets and commas, e.g.
a = (0, -1, 1)
print(*a)
produces 0 -1 1. Trying the same with f-strings fails:
print(f'{*a}')
The closest f-string option I found ...
- 8,235
2
votes
1
answer
412
views
Python datetime format: UTC time zone offset with colon
I'm trying to format a datetime object in Python using either the strftime method or an f-string. I would like to include the time zone offset from UTC with a colon between the hour and minute.
...
- 43
0
votes
2
answers
336
views
Mypy throws syntax error for multi-line f-strings, despite code running without error
I'm working with Python 3.12 and recently added mypy type-checking to my project. I've encountered an odd issue where mypy throws a syntax error for certain f-strings in my code, specifically those ...
- 8,663
1
vote
5
answers
153
views
F-string format for conditionally prefixing a value
I want to create an f-string that combines two strings, prepending a '.' character to the second if it is not empty.
reference = "file"
modifier = "read"
print(f"unknown ...
-2
votes
2
answers
129
views
Error in syntax of fstrings in function input() [closed]
I have the following code in Python 3
def inputWithDefault(text:str, default):
result = input(f"{" " * int(len(text))}{default}\r{text}")
return default if not(result is ...
- 37
0
votes
1
answer
136
views
Python>=3.8, pylint>=3.2.7 - Why doesn't local pylint raise an `f-string: unmatched '('` error here?
I'm confused as to why a local pylint check ignores the following error, but an apparently identical pylint check as part of a GitHub Actions workflow raises a syntax error.
I have a small Python test ...
- 53
1
vote
1
answer
58
views
For loop Teradata insert statement
I am pretty new to Python and looking for some assistance.
I have a large number of Teradaat tables and I am looking to take a single field from each of theose tables and put it into a new table. ...
0
votes
2
answers
75
views
How can I set a python f-string format programmatically?
I would like to set the formatting of a large integer in an fstring programmatically. Specifically, I have an integer that can span several orders of magnitude and I'd like to print it using the ...
- 2,137