判断字符串开头和结尾，字符串的置换，字符串的大小写切换

判断字符串是否以 XX 开头？得到一个布尔值

#endswith  判断字符串是否以 XX 结尾？得到一个布尔值
#v1 = input("please tell")
v1 = "我爱你"
result = v1.endswith("爱")
print(result)
#输出False
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##startsswith判断是否以XX开头，得到一个布尔值
v1 = "我爱你"
result = v1.startswith("我")
print(result)
#输出Turn

 字符串的置换

#replace置换
count = input("请输入评论信息：")
count = count.replace("hello","12")#如果输入 hello，输出12
count = count.replace("hehe","wuuw")#输入hehe，输出wuuw
print(count)

#输入1，置换2
v1 = "高清.mp4"
new_v1 = v1.replace("mp4","avi")
new_v2 = new_v1.replace("高清","步兵")
print(new_v2)

字符串大小写的切换

#变为大写
v1 = "aaaaaaa"
v2 = v1.upper()
print(v2)
#变为小写
v1 = "AAAAA"
v2 = v1.lower()
print(v2)

标签：count,结尾,print,replace,v1,v2,大小写,字符串
来源： https://www.cnblogs.com/li-aolin/p/16543893.html