Question

嗨，我今天刚刚开始学习python并开始应用我在flash卡程序上学到的东西，我想问用户他们的名字，并且只接受没有数字或符号的字母，我尝试了几种方法但是那里是我在尝试中遗漏的东西。这是我到目前为止所做的。

yname = raw_input('Your Name ?: ')
if yname.isdigit():
    print ('{0}, can\'t be your name!'.format(yname))
    print "Please use alphbetic characters only!."
    yname = raw_input("Enter your name:?")
    print "Welcome %s !" %yname

但我认为，如果用户输入任何一个角色不止一次，它最终会继续......所以我这样做了。

yname = raw_input("EnterName").isalpha()
while yname == True:
    if yname == yname.isalpha():
        print "Welcome %s " %(yname)
else:
    if yname == yname.isdigit():
        print ("Name must be alphabetical only!")
        yname = raw_input('Enter Name:').isalpha()

这个while循环一直在继续，我尝试了（ - ）和（+）原始输入变量，正如我在一些教程中看到的那样。所以我想到了使用while循环。

name = raw_input("your name"):
while True:
    if name > 0 and name.isalpha():
        print "Hi %s " %name
    elif name < 0 and name.isdigit():
        print "Name must be Alphabet characters only!"
try:
    name != name.isalpha():
except (ValueError):
     print "Something went wrong"

Answer 1

您可以稍微重新安排上次尝试以获得所需内容：

while True:
    name = raw_input("your name") # ask inside the loop
    if name and name.isalpha():
        print "Hi %s " %name
        break # leave the loop if done
    elif name and name.isdigit():
        print "Name must be Alphabet characters only!"
    else:
        print "Please enter something"

请注意，如果if name，True将为name != ""。

Answer 2

使用regexes：

import re
regex = re.compile("^[a-zA-Z]+$")

valid_name = False
while not valid_name:
   user_name = raw_input("EnterName")
   if not regex.search(user_name):
        print "this can't be your name"
    else:
        print "Hi there, {0}".format(user_name)
        valid_name = True

另外，请注意programmers often make false assumptions about human names

编辑：作为替代方案，您可以跳过编译正则表达式并只使用该模式：

if not re.search("^[a-zA-Z]+$", user_name):
    ...

但是，由于你在循环编译版本中执行它会有稍微好一点的性能，因为re.search实际上每次调用后都在后台编译正则表达式。

此外，请注意我已将match更改为search，并稍微修改了正则表达式，因为some differences因此search符合您的情况更多。

Answer 3

name = raw_input('Enter your name: ')
while not name.isalpha():
    print 'Invaid characters in name'
    name = raw_input('Enter your name: ')

Answer 4

这将检查raw_input中的两个字母，并检查我在上次尝试时尝试做的名称长度。

import string
import re

name = re.compile(r'[a-zA-Z]+') #This will check for alphabet.
yname = raw_input("Your Name:") #ask the user for input.

while not name.match(yname): 
    print "invalid characters"
    yname = raw_input("Your Name:")
if 5<=len(yname)<=10:
    print "Hi,", yname, "!"
elif len(yname)>10:
    print "too long!"
elif len(yname)<5:
    print "too short!"

字母检查作为输入

4 个答案: