Counting the number of characters in a string

# Counting the total number of the letter "a" in a string.
 
x = ("What shall we do with the drunken sailor?")

i = "a"
print (x.count(i, 0, 40))

Result:
3

Print a line in reversal

# print the text in reversal.
import sys
x = ("What shall we do with the drunken sailor?")

y = (len(x)-1)
print (y)

while y > 0:
    y = y - 1
    sys.stdout.write(x[y])
print("\n")

Result:
40
rolias neknurd eht htiw od ew llahs tahW

Perl script: What shall we do with the drunken sailor?

#!/usr/bin/perl
use strict;
use warnings;

my $x = "What shall we do with the drunken sailor?\n";
my $y = "Early in the morning.\n\n";
print "$x" x 3;
print "$y";

my $z = "Heave ho, and up she rises\n";
print $z x 3;
print $y;

Result: 
What shall we do with the drunken sailor.
What shall we do with the drunken sailor.
What shall we do with the drunken sailor.
Early in the morning.

Heave ho, and up she rises.
Heave ho, and up she rises.
Heave ho, and up she rises.
Early in the morning.

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Making an error in the text

# Hello World program in Python
 
x ="What shall we do with the drunken sailor?"
print (len(x))
print (x[0:5] +"hs"+ x[7:40])

Result: What hsall we do with the drunken sailor

Editing text with python

# editing text with python
 
x = ("What shall we do with the drunken sailor?\n")

print (x[0:4])
print (len(x))
print (x[40])