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Lists.md

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Lists

Basics

  • List is a comma-separated list of values.
primes = [1,3,5,7,11,13,17,19]

Indexing and Slicing

print primes[0]
print primes[-1]
print primes[-8]
#output
1
19
1

print primes[1:3]
print primes[0:]
print primes[:8]
print primes[-8:]
#output:
[3,5]
[1,3,5,7,11,13,17,19]
[1,3,5,7,11,13,17,19]
[1,3,5,7,11,13,17,19]

Mutability

  • List is mutable.
zero_to_five = [0,1,2,3,-4,5]
zero_to_five[4] = 4
print zero_to_five
#output:
[0,1,2,3,4,5]

letters = ['a','b','c','d','e']
letters[1:3] = ['B','C']
print letters
#output
['a','B','C','d','e']

letters[:]=[]
print letters
#output
[]

Concatenation/Nesting

letters = []
letters = letters + ['a','b','c']
print letters
#output
['a','b','c']

letters[2]=['c','d']
print letters
#output
['a','b',['c','d']]

print letters[2][0]
#output
c