What are the differences between is and = = in python

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=-> values on both sides of the comparison.

Is- > the memory address of the comparison, check it with id ().

Small data pool ☆☆☆

Numeric small data pool range-5cm 256 (within this range, different variables are assigned the same value and their memory addresses are equal)

If there are special characters in the string, their memory addresses are different.

Within a single character * 20 in a string, their memory addresses are the same, while those above * 21 are different.

Note: the above can only be tested on the terminal, but cannot be run in pycharm, because pycharm defaults to True, and when the terminal exceeds the above condition, it is False.

Practice

N = 10

N1 = 10

Print (n = = N1)

# id () check the memory address

# all data types have memory addresses

# is to check memory address

Print (id (n))

Print (n is N1) # True

# string

A = 'alex'

B = 'alex'

Print (an is b) # True

# list

L1 = [1pm 2pm 3]

L2 = [1, 2, 2, 3]

Print (L1 is L2) # False

# tuple

Tu = (1, 2, 3)

Tu1 = (1, 2, 3)

Print (tu is tu1) # False

# Dictionary

Dic = {'name':'alex'}

Dic1 = {'name':'alex'}

Print (dic is dic1) # false

# tuple

Tu = (1, 4, 4, 6)

Tu1 = (1, 4, 4, 6)

Print (tu is tu1) # False

# Mini datapool-5 '256

N =-10000

N1 =-10000

Print (n is N1) # False, running in pycharm beyond the small data pool is also True

A = 10000

B = 10000

Print (id (a), id (b))

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