Can someone help me? The last row of the code gives me an error.
os.chdir("./envolventes")
diractual = os.getcwd()
ficheros = os.listdir(diractual)
lista_sin_D = [ x for x in ficheros if "D" not in x ]
import re
lista_A_menor45 = [ x for x in ficheros if int(re.match('.*?([0-9]+)$',
x).group(1)) < 45 ]
As the files have a .txt extension, you should change the regular expression by .*?([0-9]+).txt , thus remaining:
lista_A_menor45 = [ x for x in ficheros if int(re.match('.*?([0-9]+).txt', x).group(1)) < 45 ]
For regular expressions I highly recommend the following page to evaluate and test them: regex101
You have a file that does not fit the pattern you give it.
Before extracting the group, you should check if .match() returns None . So you can apply it in a list compression you can do so:
def check(x):
m = re.match('.*?([0-9]+)$', x)
return False if m is None else int(m.group(1)) < 45
[ x for x in ficheros if check(x) ]
To know which files do not pass, just invert the filter:
[ x for x in ficheros if not check(x) ]