大约有 13,922 项符合查询结果（耗时：0.0288秒） [XML]
How do I get the row count of a pandas DataFrame?
...
You can use the .shape property or just len(DataFrame.index). However, there are notable performance differences ( len(DataFrame.index) is fastest).
Code to reproduce the plot:
import numpy as np
import pandas as pd
import perfplot
perfplot.save(
"out.png",
setup=lambda ...
What is the difference between a string and a byte string?
...t encoding may map the same bytes to a different string:
>>> b'\xcf\x84o\xcf\x81\xce\xbdo\xcf\x82'.decode('utf-16')
'蓏콯캁澽苏'
>>> b'\xcf\x84o\xcf\x81\xce\xbdo\xcf\x82'.decode('utf-8')
'τoρνoς'
Once you know which one to use, you can use the .decode() method of the b...
How to concatenate items in a list to a single string?
...
I kind of expected sentence.join(" ") to work as well, since the reverse operation is list.split(" "). Any idea if this is going to be added to Python's methods for lists?
– Wouter Thielen
Aug 23 '...
ImportError: Cannot import name X
...ld know that two classes should NEVER be dependant on each other. This is extremely important in C++, and even if it's not the #1 thing in Python, it's still a really good idea to follow this rule. Never have two classes which know each other, ever. If you need help with creating the structure for y...
How to print (using cout) a number in binary form?
...about operating systems and we're learning how to convert from binary to hexadecimal, decimal to hexadecimal, etc. and today we just learned how signed/unsigned numbers are stored in memory using the two's complement (~number + 1).
...
Chain-calling parent initialisers in python [duplicate]
...
The way you are doing it is indeed the recommended one (for Python 2.x).
The issue of whether the class is passed explicitly to super is a matter of style rather than functionality. Passing the class to super fits in with Python's philosophy of "explicit is better than implicit".
...
Python's most efficient way to choose longest string in list?
...
From the Python documentation itself, you can use max:
>>> mylist = ['123','123456','1234']
>>> print max(mylist, key=len)
123456
share
|
improve this answ...
What encoding/code page is cmd.exe using?
When I open cmd.exe in Windows, what encoding is it using?
6 Answers
6
...
What is the difference between List (of T) and Collection(of T)?
...don't believe could be done with an IList.
In short, it's much easier to extend it after the fact, which could potentially mean a lot less refactoring.
share
|
improve this answer
|
...
Concept behind these four lines of tricky C code
...- -------- -------- --------
+ shows the position of the sign; ^ of the exponent, and - of the mantissa (i.e. the value without the exponent).
Since the representation uses binary exponent and mantissa, doubling the number increments the exponent by one. Your program does it precisely 771 times, ...