Python字符串魔法四

test = "sadaddd张振贤"   #识别是否全是字母
v = test.isalpha()
print(v)


test = "②123二"           #识别当前是否是数字
v1 = test.isdecimal()   #十进制小数
print(v1)
v2 = test.isdigit()    #包含②符号
print(v2)
v3 = test.isnumeric()   #包含中文数字
print(v3)

test = "ALex"       #大小写转换
v = test.swapcase()
print(v)

#字母，数字，下划线：标识符 def calss
a = "kkk_123"           #识别是否是标识符
v =  a.isidentifier()
print(v)

test = "jdiad\tad"   #是否存在不可显示的字符  #\t制表符  #\n换行
v= test.isprintable()
print(v)

test = "        "  #判断是否全是空格
v = test.isspace()
print(v)

test = "TUDUDUDUDU"
v = test.istitle() #判断是否是标题 (标题）=大写字母开头
print(v)
v1 = test.title()  #帮你改成标题格式
print(v1)

test = "你是风儿我是沙"  #将字符串每一个元素按照指定分隔符进行拼接
print(test)
t = "_"
v = t.join(test)
print(v)

test = "alex"              #把字符放在左边
v = test.ljust(20,"*")
print(v)

test = "alex"                #把字符放在右边
v = test.rjust(20,"*")
print(v)

test = "alex"                  #填充字符
v = test.zfill(10)
print(v)

#判断全部是否大小写 和 转换为大小写 
test = "Alex"
v1 = test.islower()
v2 = test.casefold()
print(v1,v2)

test = "alex"
v1 = test.isupper()
v2 = test.upper()
print(v1,v2)

Python字符串魔法四

原文：https://www.cnblogs.com/159357zzx/p/11458178.html