python 2.7 check if variable is none
>>> NoneType = type(None)
>>> x = None
>>> type(x) == NoneType
True
>>> isinstance(x, NoneType)
Truepython 2.7 check if variable is none
>>> NoneType = type(None)
>>> x = None
>>> type(x) == NoneType
True
>>> isinstance(x, NoneType)
Truepythonhow to check if value is None
# How to check if a variable is None
var = None
# variable is None in this example
if var is None:
# if var is None
print("var is None")
# code...
else:
# if var is not None
print("var is not None")
# code...
# result of above example "var is None"
var = "sometext"
# variable is not None in this example
if var is None:
# if var is None
print("var is None")
# code...
else:
# if var is not None
print("var is not None")
# code...
# result of above example "var is not None"None python
# The None keyword is effectively the same as null
# Functions without a return will return None
>>> def has_no_return():
... pass
>>> has_no_return()
>>> print(has_no_return())
None
# Often, you’ll use None as part of a comparison.
# One example is when you need to check and see if some result or parameter is None.
>>> import re
>>> match = re.match(r"Goodbye", "Hello, World!")
>>> if match is None:
... print("It doesn't match.")
"It doesn't match."Copyright © 2021 Codeinu
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