A brief introduction to the for loop and range() function in Python (with examples)

This article brings you a brief introduction to the for loop and range() function in Python. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

for loop

The For … in statement is another type of loop statement, which is characterized by executing on a series of objects Iterates, that is, it will traverse each item in the sequence

Note:

1. The else part is optional Chosen. When it is included in a loop, it always starts execution after the for loop ends, unless the program encounters a break statement.

2. for... in can work in any queue. Some generate a list of numbers through the built-in range function, or it can be a queue containing any type of object.

Eg1.数字列表
for i in range(1,5):
print(i)
else:
print("for 循环结束")

Eg2. 字符串列表
lessons = ["语文","数学","英语"]
for lesson in lessons:
    print("------------------"+'\n'+lesson)
else:
    print("------------------")
    print("for 循环结束")

range() function

General form: range(start, stop[, step] )

start: Start value, the value is 0, that is, if this item is not written, start = 0 is considered.
stop: The ending value, this must be written.
step: The step size of the change, the default is 1.

Eg.
# range 类型
a = list(range(10,0,-1))
print(a)

Parallel iteration

Iteration, the performance in Python is to use a for loop to obtain a certain amount from the object quantity of elements.
Use for loops for key-value pairs of lists, strings, and dictionaries. This is iteration.
#The parameter of Zip() needs to be an iterable object. The return value of the Zip function is a zip object.

Eg1. 两个列表中值对应相加

a = [1,2,3,4,5]
b = [9,8,7,6,5]
c= []
for x,y in zip(a,b):
    d.append(x+y)
else:
    print(d)

rrree

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