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def check_string(str1):
messg = [
lambda str1: any(x.isupper() for x in str1) or 'String must have 1 upper case character.',
lambda str1: any(x.islower() for x in str1) or 'String must have 1 lower case character.',
lambda str1: any(x.isdigit() for x in str1) or 'String must have 1 number.',
lambda str1: len(str1) >= 7 or 'String length should be atleast 8.',]
result = [x for x in [i(str1) for i in messg] if x != True]
if not result:
result.append('Valid string.')
return result
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