闲话很少说,开始记录吧。app
1.如何使用变量:ui
name 定义为一个变量,存储了一个字符串。spa
name = 'miao min'
对一个字符串进行大小写的转换,可使用:排序
upper()【把字符串所有变为大写】ip
lower()【把字符串所有变为小写】字符串
title()【把首字母变为大写】string
链接字符串使用+:it
print("miao" + "min")变量
number = 3 print("my favorite number is " + str(number))PS:数字和字符串链接时,须要把数字转换成str类型
数字之间的运算:im
print(2+6) print(9-1) print(2*4) print(24/3)
去除字符串的空白:
string = " abc "
string.lstrip()【去除左边的空白】
string.rstrip()【去除右边的空白】
string.strip()【去除全部的空白部分】
2.列表的使用
列表由一系列特定顺序排列的元素组合。
sorted(countries)【临时排序】
countries = ["Japan", "Paris", "America", "China", "Helan"] print(countries) print(sorted(countries)) print(countries) print(sorted(countries,reverse=True)) print(countries) countries.reverse() print(countries) countries.reverse() print(countries) countries.sort() print(countries) countries.sort(reverse=True) print(countries)
names = ["Jay", "Jim", "Star", "Bob"] print("Please " + names[0] + " " + names[1] + " " + names[2] + " " + names[3] + " eating food") print(names[2] + " can't join") names[2] = "Sanny" print("Please " + names[0] + " " + names[1] + " " + names[2] + " " + names[3] + " eating food") names.insert(0, "min") print(names) names.append("cui") print(names) a = names.pop() print("sorry " + a) b = names.pop() print("sorry " + b) names.pop() names.pop() del names[1] del names[0] print(names)