Python slicing

Python slice an array

a[start:stop]  # items start through stop-1
a[start:]      # items start through the rest of the array
a[:stop]       # items from the beginning through stop-1
a[:]           # a copy of the whole array
Example:
>>> a = [1, 2, 3, 4, 5, 6, 7, 8]
>>> a[1:4]
[2, 3, 4]

Source: stackoverflow.com

List slicing in python

# List slicing
friends = ["Harry", "Tom", "Rohan", "Sam", "Divya", 45]
print(friends[0:4])
print(friends[-4:])

Is : and :: the same in python slice

a[-1]    # last item in the array
a[-2:]   # last two items in the array
a[:-2]   # everything except the last two items

Source: stackoverflow.com

Slicing in python listing

list_example = ["python","ruby","java","javascript","c#","css","html"]
print(list_example[3])#javascript
print(list_example[0])#python
print(list_example[6])#html
print(list_example[0:3]) #will print the programming language under python and javascript
print(list_example[:3]) all languages under python to javascript

Python slicing

#slicig
b=("hello world")
print(b[2:])

Python slice second element of list of lists

import numpy as np

A = np.array([[1,2,3,4,5],[1,2,3,4,5],[1,2,3,4,5]])
A[:,:3]

Out[3]: 
array([[1, 2, 3],
       [1, 2, 3],
       [1, 2, 3]])

Source: stackoverflow.com

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