• Typical syntax is the following: 
    myList = [1,2,3,4]
for item in myList:
  print(item)
  • All the statement covered in while loops, can also be used in for loops as well.
  • If you want to write a stub for a for loop and then come back to it later, we can use pass. ``` animalLookup = { ‘a’: [‘aardvark’, ‘antelope’], ‘b’: [‘bear’], ‘c’: [‘cat’], ‘d’: [‘dog’], }

for letter, animals in animalLookup.items(): pass

* Also possible to skip the rest of the loop with a `continue` statement.

for letter, animals in animalLookup.items(): if len(animals) > 1: continue print(f’Only one animal! {animals[0]}’)

* This would output:

Only one animal! bear Only one animal! cat Only one animal! dog

* Can also use a `break` statement with:

for letter, animals in animalLookup.items(): if len(animals) > 1: print(f’Found {len(animals)} animals: {animals}’) break

* Outputs:

Found 2 animals: [‘aardvark’, ‘antelope’]

* If there were two or more instances of animals in the list, it stops after the first one.
* There is also the `break else` statement or more formally the `for else` statement.
* Example for finding Prime Numbers (computers do this for cryptography and security).
* Example below is finding all the primes between 2 and 100:

for number in range (2, 100): for factor in range(2, int(number ** 0.5) + 1): if number % factor == 0: break

The else statement will only be called, if a break did not happen in the previous loop

	 else:
	     print(f'{number} is prime!') ``` * `number` is the one we are testing for Primality. * Then we want to loop through all the potential factors.
* `** 0.5` is the square root of the number
* The number goes to the one halfth exponent.
	* If we don't find a factor by that point, we know the number is prime. * We can use the module (`%`) to check if it is evenly divisible. * Will then output: ``` 2 is prime! 3 is prime! 5 is prime! ``` * and so on * `break` - `else` pattern can also be used in a `while` loop as well. * Sometimes you will see Python code similar to this: ``` for number in range (2, 100):
found_factors = False
for factor in range(2, int(number ** 0.5) + 1):
       if number % factor == 0:
	         found_factor = True # The else statement will only be called, if a break did not happen in the previous loop
	 if not found_factors:
	     print(f'{number} is prime!') ``` * The output will still be the same and it is a lot more code required. The previous line is much for `Pythonic`

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