字符串常用操作

常用：分割、長度、索引、切片
r = (1,2,3,4,5)#只讀列表元組
name = "liangml"
strip
username = input("user:")
if username.strip() == "liangml":#strip可以將輸入前后的空格都換掉
    print("welcome")

split
names = "liangml","tom","jack"
name2 = names.split(",")#split是names拆分開來（得到一個列表）
print("|".join(name2))#join是將name2結果以|形式合并到一起

print("" in name)#有沒有空格

capitalize
print(name.capitalize())#capitalize是將名字的首字母大寫

format
#format字符串兩種賦值方式
msg = "Hello,{name},It's been a long {age} since last time sopke...."
#msg2 = msg.format(name="zhangsan",age=111)
#print(msg2)
msg2 = "lisi{0},dddd{1}"
print(msg2.format("liangml",22))

center
print(name[2:4])
print(name.center(40,"-"))#center可以指定長度,將字符串兩邊的長度均勻的分開

find
print(name.find("a"))#find查找賦值中有幾個包含字符串

isdigit
age = input("your age:")
if age.isdigit():#isdigit判斷他是否為數字
    age = int(age)
else:
    print("invalid data type")

isalnum
name = "liangml!dfs"
print(name.isalnum())#不容許復制里面有特殊字符

endswith、startswith
print(name.endswith("dfsd"))
print(name.startswith("dfsfds"))

upper、lower
print(name.upper().lower())#upper賦值全部大寫，lower全部變小

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