Summary of the differences between in and is in python

1. Distinction

in: On the one hand, it can be used to check whether there is a certain value in a sequence (list, range, string, etc.). It can also be used to traverse sequences in a for loop.

is: used to determine whether two variables are the same object. If the two objects are the same object, return True, otherwise return False. To distinguish it from ==, use the == operator to determine whether the two variables are equal.

2. Example

x = ["Zhang San","Li Si","Wang Wu"]

"Zhang San" in x

# -------------------------

for i in range(3):
print(i)

Knowledge points expansion:

Three basic elements of python objects: id (identity identity), type (data type) and value (value).

is operator: The unique identity (id) between objects is judged.

== operator: It determines whether the value (value) between objects is the same, and the object's __eq()__ method is called.

in Member ID: Determine whether a single object is in a container.

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