PROGRAMMING
Php
Assign
A variable must be assigned before use.
# Variable assignement ...
#
# A variable must be assign before use
y = 0
y = y + 1
assert y == 1
# z = z + 1
# # NameError: name 'z' is not defined
Reassignment
p 120 In Python it is legal to reassign a variable.
# In Python it is legal to reassign a variable.
# An assignment can make two variables equal, but not permanent.
x = 5
x = 7
assert x == 7
assert x != 5
a = 1
b = 1
assert a == b
a = 2
assert a != b
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