"""
variable
v.s. constant

A variable is named location used to store data in the memory


define first before use
define/declare

static language, dynamic language

"""
a = None
a = 1
a = 'abc'
a = 234
a = 'd'
print()


#
a = 2
a = a + 1
b = 2

#
x = 1
y = 2
z = 3
print(x,y,z)

x, y, z = 11, 21, 31
print(x,y,z)


#
x, y, z = 11, 11, 11
x = y = z = 11











