How to test characters of a string

[Christian Gollwitzer]

Am 07.06.22 um 21:56 schrieb Dave:
> It depends on the language I’m using, in Objective C, I’d use isNumeric, just wanted to know what the equivalent is in Python.
> 

Your problem is also a typical case for regular expressions. You can 
create an expression for "starts with any number of digits plus optional 
whitespace" and then replace this with nothing:

> chris at linux-tb9f:~> ipython
> Python 3.6.15 (default, Sep 23 2021, 15:41:43) [GCC]
> Type 'copyright', 'credits' or 'license' for more information
> IPython 7.13.0 -- An enhanced Interactive Python. Type '?' for help.
> 
> In [1]: import re                                                                                                                                                                        
> 
> In [2]: s='05 Trinket'                                                                                                                                                                   
> 
> In [3]: re.sub(r'^\d+\s*', '', s)                                                                                                                                                        
> Out[3]: 'Trinket'
> 

If it doesn't match, it will do nothing:

> In [4]: s='Es geht los'                                                                                                                                                                  
> 
> In [5]: re.sub(r'^\d+\s*', '', s)                                                                                                                                                        
> Out[5]: 'Es geht los'

Some people on this list don't like regexes but for tasks like this they 
are made and working well.

^ is "starts with"
\d is any digit
\s is any space
+ is at least one
* is nothing or one of

Christian