大约有 13,000 项符合查询结果（耗时：0.0331秒） [XML]
How does Django's Meta class work?
...For latest version of Django: Django docs: Model Meta options
Metaclass in Python:
The best description is here: What are metaclasses in Python?
share
|
improve this answer
|
...
Check if an apt-get package is installed and then install it if it's not on Linux
..."
echo $?
sudo apt remove -y "$pkg"
dpkg -s "$pkg"
echo $?
ls -l /usr/lib/python3/dist-packages/certbot/reporter.py
sudo apt remove --purge certbot
dpkg -s "$pkg"
echo $?
ls -l /usr/lib/python3/dist-packages/certbot/reporter.py
then:
the first two echo $? output 0, only the third one outputs 1...
Any way to properly pretty-print ordered dictionaries?
I like the pprint module in Python. I use it a lot for testing and debugging. I frequently use the width option to make sure the output fits nicely within my terminal window.
...
What does enumerate() mean?
What does for row_number, row in enumerate(cursor): do in Python?
5 Answers
5
...
Check if a Python list item contains a string inside another string
...bc-456'])
The test for iterable may not be the best. Got it from here: In Python, how do I determine if an object is iterable?
share
|
improve this answer
|
follow
...
Parsing boolean values with argparse
...
nargs='?' means zero or one argument. docs.python.org/3/library/argparse.html#nargs
– Maxim
Aug 3 '17 at 12:05
1
...
How can I configure Logback to log different levels for a logger to different destinations?
...warn and error messages to stderr, and everything else to stdout.
logback.xml
<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<filter class="com.foo.StdOutFilter" />
...
</appender>
<appender name="stderr" cl...
What are the differences between numpy arrays and matrices? Which one should I use?
... 2]
# [3 4]]
print(a*b)
# [[13 20]
# [ 5 8]]
On the other hand, as of Python 3.5, NumPy supports infix matrix multiplication using the @ operator, so you can achieve the same convenience of matrix multiplication with ndarrays in Python >= 3.5.
import numpy as np
a = np.array([[4, 3], [2, 1...
Filter by property
...filters operate at the database level, generating SQL. To filter based on Python properties, you have to load the object into Python to evaluate the property--and at that point, you've already done all the work to load it.
...
Batch Renaming of Files in a Directory
...asy way to rename a group of files already contained in a directory, using Python?
13 Answers
...