Loops in Python
While
count = 0
print('Starting')
while count < 10:
print(count, '', end='')
count += 1
print() # not part of the while loop
print('Done')
"""
Starting
0 1 2 3 4 5 6 7 8 9
Done
"""
There are no do while loops in Python
For
# Loop over a set of values in a range
print('Print out values in a range')
for i in range(0, 10):
print(i, ' ', end='')
print()
print('Done')
"""
Print out values in a range
0 1 2 3 4 5 6 7 8 9
Done
"""
# Now use values in a range but increment by 2
print('Print out values in a range with an increment of 2')
for i in range(0, 10, 2):
print(i, ' ', end='')
print()
print('Done')
"""
Print out values in a range with an increment of 2
0 2 4 6 8
Done
"""
# Now use an 'anonymous' loop variable
for _ in range(0, 10):
print('.', end='')
print()
print('-' * 25)
# Illustrates use of break statement
print('Only print code if all iterations completed')
num = int(input('Enter a number to check for: '))
for i in range(0, 6):
if i == num:
break
print(i, ' ', end='')
print('Done')
"""
Only print code if all iterations completed
Enter a number to check for: 7
0 1 2 3 4 5 Done
"""
# Illustrates use of continue statement
for i in range(0, 10):
print(i, ' ', end='')
if i % 2 == 1:
continue
print('hey its an even number')
print('we love even numbers')
print('Done')
"""
0 hey its an even number
we love even numbers
1 2 hey its an even number
we love even numbers
3 4 hey its an even number
we love even numbers
5 6 hey its an even number
we love even numbers
7 8 hey its an even number
we love even numbers
9 Done
"""
# Illustrates use of else statement with a for loop
print('Only print code if all iterations completed')
num = int(input('Enter a number to check for: '))
for i in range(0, 6):
if i == num:
break
print(i, ' ', end='')
else:
print()
print('All iterations successful')
print('Done')
"""
Only print code if all iterations completed
Enter a number to check for: 6
0 1 2 3 4 5
All iterations successful
Done
"""
