* and ** operators in python (star, double star operators)

starOperators.py

# * and ** operators in python

data1 = [1,2,3]
print(data1)
print(*data1)
'''
[1, 2, 3]
1 2 3
'''
# join two lists
data2 = ['a', 'b', 'c']
res = [*data1, *data2]
print(res)
'''
[1, 2, 3, 'a', 'b', 'c']
'''
# join a list and a tuple
data3 = ('a', 'b', 'c')
res = [*data1, *data3]
print(res)
'''
[1, 2, 3, 'a', 'b', 'c']
'''
# create list from string
res = [*'hello']
print(res)
'''
['h', 'e', 'l', 'l', 'o']
'''
res = list('hello')
print(res)
'''
['h', 'e', 'l', 'l', 'o']
'''
# join two dicts
data4 = {'a1':10, 'b1':11, 'c1':12}
data5 = {'a2':20, 'b2':21, 'c2':22}
res = {**data4, **data5}
print(res)
'''
{'a1': 10, 'b1': 11, 'c1': 12, 'a2': 20, 'b2': 21, 'c2': 22}
'''
# using asterisk operator in assignment operators
x, *y = data1
print(y)
'''
[2, 3]
'''
x, y, *z = data1
print(z)
'''
[3]
'''
x, *y, z = data1 + data2
print(y)
'''
[2, 3, 'a', 'b']
'''
# a very esoteric example (comma is required because a star assignment should be in a list or tuple)
*y, = data1
print(y)
'''
[1, 2, 3]
'''
# an even more esoteric example
[*y] = data1
print(y)
'''
[1, 2, 3]
'''