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python: improve notes on loops

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thomasabishop 2023-09-01 08:45:03 +01:00
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106
Programming_Languages/Python/Syntax/Loops_in_Python.md
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@ -6,28 +6,6 @@ tags: [python]
# Loops in Python
## While
```python
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
There are three main types of `for` loop in Python and they all use the `for...in` clause:
@ -62,60 +40,33 @@ There are three main types of `for` loop in Python and they all use the `for...i
print(f"Index {index}: {fruit}")
```
### Further examples of `for in range()` loops
### Loop in increments greater than 1
// TODO: segment the examples into dedicated sections
The following loop increments by 2 on each iteration
```python
# 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')
```py
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
"""
# 0 2 4 6 8
```
# Now use an 'anonymous' loop variable
for _ in range(0, 10):
print('.', end='')
print()
### Break and continue
print('-' * 25)
#### Break
# Illustrates use of break statement
print('Only print code if all iterations completed')
num = int(input('Enter a number to check for: '))
```py
num = int(input('Enter a number from 1-6 to check for: '))
for i in range(0, 6):
if i == num:
break
print(i, ' ', end='')
print('Done')
print(i, ' ')
```
"""
Only print code if all iterations completed
Enter a number to check for: 7
0 1 2 3 4 5 Done
"""
#### Continue
# Illustrates use of continue statement
```py
for i in range(0, 10):
print(i, ' ', end='')
if i % 2 == 1:
@ -137,26 +88,25 @@ we love even numbers
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')
## While
```python
count = 0
print('Starting')
while count < 10:
print(count, '', end='')
count += 1
print() # not part of the while loop
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
Starting
0 1 2 3 4 5 6 7 8 9
Done
"""
```
> There are no `do while` loops in Python