7.字符串判断相关
是否以start开头:str.startswith('start')
是否以end结尾:str.endswith('end')
是否全为字母或数字:str.isalnum()
是否全字母:str.isalpha()
是否全数字:str.isdigit()
是否全小写:str.islower()
是否全大写:str.isupper()
str='python String function'
print '%s startwith t=%s' % (str,str.startswith('t'))
print '%s endwith d=%s' % (str,str.endswith('d'))
print '%s isalnum=%s' % (str,str.isalnum())
str='pythonStringfunction'
print '%s isalnum=%s' % (str,str.isalnum())
print '%s isalpha=%s' % (str,str.isalpha())
print '%s isupper=%s' % (str,str.isupper())
print '%s islower=%s' % (str,str.islower())
print '%s isdigit=%s' % (str,str.isdigit())
str='3423'
print '%s isdigit=%s' % (str,str.isdigit())
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