News How to use For Loops in Python

[Admin]

For loops provide a means to control the number of times your code performs a task. This can be a range, or iterating over items in an object. In this how to we will go through the steps to create your own projects using for loops.

How to use For Loops in Python : Read more

 

[bit_user]

Heh, you forgot a couple things: continue and else.

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4. More Control Flow Tools

As well as the while statement just introduced, Python uses a few more that we will encounter in this chapter. if Statements: Perhaps the most well-known statement type is the if statement. For exa...

docs.python.org

Yes! You can use else with for loops! So, instead of writing:

if my_list:
    for element in my_list:
        # do something with each element

else:
    # do something in case of empty list

You can simply write:

for element in my_list:
    # do something with each element
else:
    # do something in case of empty list

Cool story: I once suggested this feature. Guido, himself, actually shot it down. Then, like 10 years later, I noticed it had been added! I don't know if Guido changed his mind, or maybe it just got suggested again and with a different outcome.

 

[bit_user]

Also, you could include a brief example of list comprehensions:

l = [ i * 2 for i in range(5) ]

Which is equivalent to: l = [ 0, 2, 4, 6, 8 ].

For more:

5. Data Structures

This chapter describes some things you’ve learned about already in more detail, and adds some new things as well. More on Lists: The list data type has some more methods. Here are all of the method...

docs.python.org

 

[bit_user]

Lastly, you could also mention the builtin functions which do iteration and can often be used instead of loops:

• Reductions: all(), any(), min(), max(), and sum()
• enumerate()
• filter()
• map()
• zip()

See:

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Built-in Functions

The Python interpreter has a number of functions and types built into it that are always available. They are listed here in alphabetical order.,,,, Built-in Functions,,, A, abs(), aiter(), all(), a...

docs.python.org

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