split String at first letter

On 09/03/2017 at 22:23, xxxxxxxx wrote:

Hi there,

I want to split a String like "0123_456-Name_1438" and get the "Name_1438 ".
My tryout was this:

s = "0123_456-Name_1438"
for c in s:
            if int(c) :
                print c+" = ",int(c)," ",type(c)
            else:
                print c+" = ",type(c)

...a simple try if typecasting can be used to differenciate letters and numbers in a string.

The console tells: "ValueError: invalid literal for int() with base 10: 'N'"
Do you have an idea how that can be solved in python?

edit: I found str.isdigit() that does the trick 😉

On 10/03/2017 at 01:23, xxxxxxxx wrote:

Ok. that's how I solved it:

  
def stripLNumbers(s) :
    if s != False:
        num = -1
        for c in s:
            num = num + 1
            if c.isalpha() and c != "-" and c != "_":    #Is there a more elegant way to exclude special characters?
                return s[num:]

On 10/03/2017 at 06:36, xxxxxxxx wrote:

So basicly you want all after "-"

If yes simply do

    a = "0123_456-Name_1438"
    split = a.split("-")
    value = str()
    for string in split[1:]:
        value += string
        
    print value

But if you jsut want the text look about(google it) regex and re module in python 😉

On 10/03/2017 at 07:19, xxxxxxxx wrote:

Couldn't it be done with a single split call?

a = "0123_456-Name_1438"
prefix, name = a.split("-", 1)

On 10/03/2017 at 07:23, xxxxxxxx wrote:

Hahaha completly true ! Didn't know split can take two arguments...

But mine can take also one line 😛

a = "0123_456-Name_1438"
value = str().join(a.split("-")[1:])
    
print value

On 10/03/2017 at 10:51, xxxxxxxx wrote:

The condition is "at the first letter", not "after the first hyphen" 😉
Regex is probably the most simple solution.

import re
def strip_numbers(s) :
  return re.search('[A-Za-z].*', s).group()

Or in plain python (very similar to gmak's solution)

def strip_numbers(s) :
  for i, c in enumerate(s) :
    if c.isalpha() :
      return s[i:]
  raise ValueError('no alphanumerical character in string {!r}'.format(s))

Cheers,
-Niklas

On 13/03/2017 at 06:21, xxxxxxxx wrote:

THX!
Nice one, NiklasR!