liaomanlin的博客

开方math模块import mathprint(math.sqrt(144))12数学表达式print(144**0.5)12开n次方内置函数powpow(a, 1/n)字符串截取str = ‘0123456789’print(str[0:3]) #截取第一位到第三位的字符print (str[:]) #截取字符串的全部字符print (str[6:]) #截取第七个字符到结尾print (str[:-3]) #截取从头开始到倒数第三个字符之前print (str[2])

输入s = input()s 为字符串只能输入一串字符串s = int(input())s 为整型只能输入一个数字a, b = input().split()能在一行输入a,b两串字符串a, b = map(int, input().split())能在一行输入a,b两个整型数字a = list(map(int, input().split()))在一行输入n个整型数字，并形成一维数组（列表）a = [[int(j) for j in input().split()] for i

循环数组a = [1, 2, 3, 4, 5]print(a)l = len(a)for i in range(l):print(a[l-i-1], end=’ ')5 4 3 2 1字符串a = ‘csdn’b = ‘1234’l = len(a)h = len(b)for i in range(l):print(a[l-i-1], end=’ ‘)for i in range(h):print(b[h-i-1], end=’ ')n d s c4 3 2 1数字a

type()s = ‘fly’k = 123print(type(s))print(type(k))<class ‘str’><class ‘int’>倒序输出1.数组a = [1, 2, 3, 4, 5]print(a)l = len(a)for i in range(0, l):print(a[l-i-1], end=’ ')5 4 3 2 12.数字a = 12345while a>0:b=a%10a=a//10

python字母大小写的转换法一 —— 函数upper()：所有字母大写lower()：所有字母小写capitalize()：字符串的首字母大写，其他字母小写title()：每个单词首字母大写，其他小写msg = ‘edItor.youkuaiyun.com’1.print(msg.upper())2.print(msg.lower())3.print(msg.capitalize())4.print(msg.title())1.EDITOR.youkuaiyun.com（全部大写）2.editor.csd