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Use the boolean OR operator to convert None to an empty string in Python, e.g. result = None or "" . The boolean OR operator returns the value to the left if it's truthy, otherwise the value to the right is returned. Since None is a falsy value, the operation will return "" . Copied!
Use len to Check if a String in Empty in Python # Using len() To Check if a String is Empty string = '' if len(string) == 0: print("Empty string!") else: print("Not empty string!") # Returns # Empty string!
The None value is not an empty string in Python, and neither is (spaces).
None is not the same as 0, False, or an empty string. None is a data type of its own (NoneType) and only None can be None.
Probably the shortest would be
str(s or '')
Because None is False, and "x or y" returns y if x is false. See Boolean Operators for a detailed explanation. It's short, but not very explicit.
def xstr(s):
return '' if s is None else str(s)
If you actually want your function to behave like the str() built-in, but return an empty string when the argument is None, do this:
def xstr(s):
if s is None:
return ''
return str(s)
If you know that the value will always either be a string or None:
xstr = lambda s: s or ""
print xstr("a") + xstr("b") # -> 'ab'
print xstr("a") + xstr(None) # -> 'a'
print xstr(None) + xstr("b") # -> 'b'
print xstr(None) + xstr(None) # -> ''
return s or '' will work just fine for your stated problem!
def xstr(s):
return s or ""
Functional way (one-liner)
xstr = lambda s: '' if s is None else s
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