test = "aLEx"
v = test.capitalize() #首字符大写
print(v)
v1 = test.casefold() # 全部字符小写,很多未知变小写
print(v1)
v2 = test.lower() # 变小写
print(v2)
v3 = test.center(20,"*") #设置宽度,并将内容居中,20指总长度,*空白处未知填充
print(v3)
yu = "alexalexr"
v4 = yu.count("ex",0,6) # 去字符串中寻找,寻找子序列的出现次数,0和6表示在这段位置中寻找,开始位置和结束位置
print(v4)
ym = "alex" # 以什么什么结尾
v5 = ym.endswith("ex")
print(v5)
yn = "alex" # 以什么什么开始
v6 = yn.startswith("ex")
print(v6)