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Unpacking Sequences in Python

Unpacking means taking the values of a sequence such as a list, tuple, etc and storing them in separate variables.


l=["Rapid", "Coders"]
r,c=l

print(r,type(r))
print(c,type(c))

Output

Rapid <class 'str'>
Coders <class 'str'>

The number of variables on the left should be equal to the number of values in the iterable.


l=["Rapid", "Coders"]
r,c,d=l

print(r,c,d)

Output

ValueError: not enough values to unpack (expected 3, got 2)

Similarly, you can unpack a tuple, string, dict, etc.


t=("Excellent", "Coders")
a, b = t

print(a)
print(b)

print()

rapid="Rapid"
r,a,p,i,d=rapid

print(r,a,p,i,d)

print()

# On unpacking a dictionary, we get its keys
dic={"Good": "Coders", "Excellent": "Coders"}
g,e=dic

print(g)
print(e)

Output

Excellent
Coders

R a p i d

Good
Excellent

If you want to unpack only certain values, you can do something like -


r,_,p,_,d="Rapid"
print(r)
print(p)
print(d)

Output

R
p
d

If you do not want to unpack all the values as variables and store some of the values together as a list, then you can do something like -


t=("Rapid", "Coders", "Excellent", "Coders")
*a,b,c=t

print(a,type(a))
print(b,type(b))
print(c,type(c))

print()

s="Rapid"
r,*p,d=s

print(r,type(r))
print(p,type(p))
print(d,type(d))

Output

['Rapid', 'Coders'] <class 'list'>
Excellent <class 'str'>
Coders <class 'str'>

R <class 'str'>
['a', 'p', 'i'] <class 'list'>
d <class 'str'>