Why Does Typing _ In The Python Interpreter Return True?
I am getting very weird interpreter behaviour: >>> _ True >>> type(True) >>> type(_) I tried this because _ ca
Solution 1:
_
will be the result of the last evaluated command - at interpreter start up there isn't any so you'll get a NameError
... after that, you'll get the previous result... Try opening a new interpreter and doing 2 + 2
... you'll see 4
returned, then type _
... eg:
>>> _
Traceback (most recent call last):
File "<pyshell#18>", line 1, in <module>
_
NameError: name '_'isnot defined
>>> 2 + 24>>> _
4
Solution 2:
2 + 1Out[19]: 3_ + 3Out[20]: 6
_
stores the last returned value. Try it out.
Solution 3:
_
simply gives you the last result evaluated (in the REPL, not in an ordinary script). This can also mysteriously prevent objects from being deleted immediately.
Solution 4:
_ in the interactive interperter is usually the last output you received.
>>>1 + 1
2
>>>_
2
Note it only applies to outputs (printed data won't do).
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