str = "abc 123"
for c in str:
if c.isspace(): print "now is space"
if c.isalnum(): print c + " is alnum"
>>> import re
>>> patt = re.compile(r'[a-z,A-Z,\d\s]{7}',re.I|re.X)
>>> patt.match(str)
<_sre.SRE_Match object at 0xb7466b10>
>>>
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