Slicing
The meaning of the word “slice” is “a part of”. In the same way, in python, the term “string slice” refers to a part of the string, where strings are sliced using a range of indices.
Suppose we have a string named “str”. ,
if we give str[n:m]
where n and m are integers and valid indices. Python will return a part of a string by returning the characters falling between indices n and m. starting from n,n+1,n+2,n+3….m-1.
Example:1
n=”computer”
Positive index
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
c |
O |
m |
p |
u |
t |
e |
r |
|
-8 |
-7 |
-6 |
-5 |
-4 |
-3 |
-2 |
-1 |
Negative index
n=”computer”
print(n)
print(n[0:4])
print(n[1:3])
print(n[4:7])
print(n[2:6])
print(n[3:7])
output:
computer
comp
om
ute
mput
pute
n="computer" print(n) print(n[0:4]) print(n[1:3]) print(n[4:7]) print(n[2:6]) print(n[3:7])
Output:
computer comp om ute mput pute >>>
Example:2
n1=”catalyst”
Positive index
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
c |
a |
t |
a |
l |
y |
s |
t |
|
-8 |
-7 |
-6 |
-5 |
-4 |
-3 |
-2 |
-1 |
Negative index
n1=’catalyst’
print(n1)
print(n1[0:7])
print(n1[2:4])
print(n1[3:4])
print(n1[2:6])
print(n1[4:7])
output:
catalyst
catalys
ta
a
taly
lys
n1='catalyst' print(n1) print(n1[0:7]) print(n1[2:4]) print(n1[3:4]) print(n1[2:6]) print(n1[4:7])
Output:
catalyst catalys ta a taly lys >>>
slicing with negative index
Example:3
n=”computer”
Positive index
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
c |
a |
t |
a |
l |
y |
s |
t |
|
-8 |
-7 |
-6 |
-5 |
-4 |
-3 |
-2 |
-1 |
Negative index
n=”computer”
print(n)
print(n[0:4])
print(n[-3:])
print(n[-7:-2])
print(n[-6:])
print(n[-6:4])
output:
computer
comp
ter
omput
mputer
mp
n="computer" print(n) print(n[0:4]) print(n[-3:]) print(n[-7:-2]) print(n[-6:]) print(n[-6:4])
Output:
computer comp ter omput mputer mp >>>
Example:4
n1=”catalyst”
Positive index
0 1 2 3 4 5 6 7
c a t a l y s t
-8 -7 -6 -5 -4 -3 -2 -1
Negative index
n1=’catalyst’
print(n1)
print(n1[-0:])
print(n1[-5:-4])
print(n1[-7:-4])
print(n1[-6:-2])
print(n1[-7:])
output:
catalyst
catalyst
a
ata
taly
atalyst
n1='catalyst' print(n1) print(n1[-0:]) print(n1[-5:-4]) print(n1[-7:-4]) print(n1[-6:-2]) print(n1[-7:])
Output:
catalyst catalyst a ata taly atalyst >>>
combination of positive and negative index
Example:5
n=”computer”
Positive index
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
c |
o |
m |
p |
u |
t |
e |
r |
|
-8 |
-7 |
-6 |
-5 |
-4 |
-3 |
-2 |
-1 |
Negative index
n=”computer”
print(n)
print(n[0:4])
print(n[4:-2])
print(n[-7:2])
print(n[6:-2])
print(n[5:-2])
print(n[2:-2])
output:
computer
comp
ut
o
t
mput
n="computer" print(n) print(n[0:4]) print(n[4:-2]) print(n[-7:2]) print(n[6:-2]) print(n[5:-2]) print(n[2:-2])
Output:
computer comp ut o t mput >>>
Example:6
n1=”catalyst”
Positive index
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
c |
a |
t |
a |
l |
y |
s |
t |
|
-8 |
-7 |
-6 |
-5 |
-4 |
-3 |
-2 |
-1 |
Negative index
n1=’catalyst’
print(n1)
print(n1[-7:7])
print(n1[-5:6])
print(n1[-3:4])
print(n1[-6:6])
print(n1[-4:7])
output:
catalyst
atalys
aly
taly
lys
n1='catalyst' print(n1) print(n1[-7:7]) print(n1[-5:6]) print(n1[-3:4]) print(n1[-6:6]) print(n1[-4:7])
Output:
catalyst atalys aly taly lys >>>
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