python - Comment vérifier si la chaîne est vide

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if not myString: 

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if not some_string: 

if some_string: 

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if not my_string: 

 >>> bool("")  False  >>> bool("   ")  True  >>> bool("   ".strip())  False 

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def isBlank (myString):     if myString and myString.strip():         #myString is not None AND myString is not empty or blank         return False     #myString is None OR myString is empty or blank     return True 

def isNotBlank (myString):     if myString and myString.strip():         #myString is not None AND myString is not empty or blank         return True     #myString is None OR myString is empty or blank     return False 

def isBlank (myString):     return not (myString and myString.strip())  def isNotBlank (myString):     return bool(myString and myString.strip()) 

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def is_not_blank(s):     return bool(s and not s.isspace()) 

print is_not_blank("")    # False print is_not_blank("   ") # False print is_not_blank("ok")  # True print is_not_blank(None)  # False