Python extracts numbers in a string

Title: "This is a simplification of a complex problem" here is a list of strings, extracting the second number in the string, and judging if it is greater than 1000, and if so, remove the line from the list.

1000\t1002\n

... "omitted" ....

Code:

<pre name= "code" class= "python" >oldstr = "1000\t1002\n" NEWSTR = oldstr# match target digit left string t=newstr.index ("\ t") Newstr = Newstr.lstrip (newstr[0:t]) Newstr = Newstr.lstrip ("\ t") Newstr = Newstr.rstrip ("\ n") if int (newstr) >1000:print ' Ok ' else:print ' sorry '

#结果: OK

You can then continue with the subsequent delete operation.

Easy Error 1: After the string is strip (), the string content remains unchanged if no value is assigned.

>>> Newstr.lstrip ("\ t") ' 1002\n ' >>> newstr.rstrip ("\ n") ' \t1002 '

One more example:

>>> ss= "124" >>> ss[0] ' 1 ' >>> Ss.lstrip (ss[0]) ' [1 ' >>> ss[0] #ss [0] remain the same as ' >> ' ' > Ss=ss.lstrip (ss[0]) # assignment SS get new value >>> SS ' >>> ss[0] #ss [0] change ' 2 '

Easy Error 2: If NEWSTR[0:T] is changed to newstr[0:t+1], you cannot get 1002, but 002. Cause unknown origin.

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Python extracts numbers in a string