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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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commit 2f343023f0
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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 # 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 ## For
There are three main types of `for` loop in Python and they all use the `for...in` clause: 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}") 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 ```py
# 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): for i in range(0, 10, 2):
print(i, ' ', end='') print(i, ' ', end='')
print() print()
print('Done')
""" # 0 2 4 6 8
Print out values in a range with an increment of 2 ```
0 2 4 6 8
Done
"""
# Now use an 'anonymous' loop variable ### Break and continue
for _ in range(0, 10):
print('.', end='')
print()
print('-' * 25) #### Break
# Illustrates use of break statement ```py
print('Only print code if all iterations completed') num = int(input('Enter a number from 1-6 to check for: '))
num = int(input('Enter a number to check for: '))
for i in range(0, 6): for i in range(0, 6):
if i == num: if i == num:
break break
print(i, ' ', end='') print(i, ' ')
print('Done') ```
""" #### Continue
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 ```py
for i in range(0, 10): for i in range(0, 10):
print(i, ' ', end='') print(i, ' ', end='')
if i % 2 == 1: if i % 2 == 1:
@ -137,26 +88,25 @@ we love even numbers
we love even numbers we love even numbers
9 Done 9 Done
""" """
```
# Illustrates use of else statement with a for loop ## While
print('Only print code if all iterations completed')
num = int(input('Enter a number to check for: ')) ```python
for i in range(0, 6): count = 0
if i == num: print('Starting')
break while count < 10:
print(i, ' ', end='') print(count, '', end='')
else: count += 1
print()
print('All iterations successful') print() # not part of the while loop
print('Done') print('Done')
""" """
Only print code if all iterations completed Starting
Enter a number to check for: 6 0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 5
All iterations successful
Done Done
""" """
``` ```
> There are no `do while` loops in Python