Python 不喜欢 FP 的，而且 map / filter 是惰性的，list comprehension不是。循环比 list comprehension...
deftest_for(array): a=[]foriinarray: a.append(i+1)returna dis.dis(test_for)20 BUILD_LIST 03 STORE_FAST 1(a)3 6 SETUP_LOOP 31 (to 40)9LOAD_FAST 0 (array)12GET_ITER>> 13 FOR_ITER 23 (to 39)16 STORE_FAST 2(i)4 19 LOAD_FAST 1(a)22LOAD_ATTR 0 (append)25 LOAD_FAST ...
列表解析式是创建或访问列表的一种紧凑方法，列表解析式被认为执行速度比 用 for 循环快。语法：# synt...
【Python学习】- List comprehension A list comprehension allows you to generate this same list in just one line of code. A list comprehension combines the for loop and the creation of new elements into one line, and automatically appends each new element. squares = [value**2 for value in ra...
This example shows how to create a list of coordinate pairs using nested loops in a list comprehension. Code: # Create a list of coordinate pairs (x, y) for x and y in range(3) pairs = [(x, y) for x in range(3) for y in range(3)] ...
How can you add conditional logic to a list comprehension in Python?Show/Hide Is a list comprehension faster than a for loop in Python?Show/Hide How do you optimize performance with list comprehensions in Python?Show/Hide Take the Quiz: Test your knowledge with our interactive “When to...
Get the 5 Keys to a Strong Start with Python Table of Contents Next Up04:28 Turning a for loop into a list comprehension If you're new to comprehensions, I recommend copy-pasting your way from a loop to comprehension to anchor your existing understanding offorloops with your new knowledge...
Python List Comprehension Syntax of List Comprehension [expression for item in list if condition == True] Here, for every item in list, execute the expression if the condition is True. Note: The if statement in list comprehension is optional. for Loop vs. List Comprehension List comprehension...
在python中,list comprehension(或译为列表推导式)可以很容易的从一个列表生成另外一个列表,从而完成诸如map, filter等的动作,比如: 要把一个字符串数组中的每个字符串都变成大写: names = ["john", "jack", "sean"] result = [] for name in names: ...
Without list comprehension you will have to write aforstatement with a conditional test inside: ExampleGet your own Python Server fruits = ["apple","banana","cherry","kiwi","mango"] newlist = [] forxinfruits: if"a"inx: newlist.append(x) ...