for loops¶

Looping lists¶

In [1]:
my_list = [1, 2, 3, 4, "Python", "is", "neat"] for item in my_list: print(item) 
1 2 3 4 Python is neat

break¶

Stop the execution of the loop.

In [2]:
for item in my_list: if item == "Python": break print(item) 
1 2 3 4

continue¶

Continue to the next item without executing the lines occuring after continue inside the loop.

In [3]:
for item in my_list: if item == 1: continue print(item) 
2 3 4 Python is neat

enumerate()¶

In case you need to also know the index:

In [4]:
for idx, val in enumerate(my_list): print(f"idx: {idx}, value: {val}") 
idx: 0, value: 1 idx: 1, value: 2 idx: 2, value: 3 idx: 3, value: 4 idx: 4, value: Python idx: 5, value: is idx: 6, value: neat

Looping dictionaries¶

In [5]:
my_dict = {"hacker": True, "age": 72, "name": "John Doe"} for val in my_dict: print(val) 
hacker age name
In [6]:
for key, val in my_dict.items(): print(f"{key}={val}") 
hacker=True age=72 name=John Doe

range()¶

In [7]:
for number in range(5): print(number) 
0 1 2 3 4
In [8]:
for number in range(2, 5): print(number) 
2 3 4
In [9]:
for number in range(0, 10, 2): # last one is step print(number) 
0 2 4 6 8