For Loops and Lists in Python | Learn Python From Scratch 4 | Kovolff смотреть онлайн

Let’s take a list abc = [23, ‘apples’, 47.03, ‘cars’]

A simple for loop to iterate through this list would look like this
for a in abc:
print(a)

a: Random variable name for the individual elements
abc: List name

This would produce:
23
‘apples’
47.03
‘cars’

Another way of creating for loops is to iterate through a range of numbers:
For b in range(5):
print(b)

This iterates through all integers from 0 to 5 excluding 5, and yields:
0
1
2
3
4

You can also define a start and end point for your iteration, by inserting in the range function the starting and end point of your iteration

For c in range(2, 7):
print(c)

This produces:
2
3
4
5
6

A more professional way to create for loops is not to depend on the individual elements, but to use indices instead.

Going back to our original list abc = [23, ‘’apples’, 47.03, ‘cars’], we can write our for loop this way:

for d in range(len(abc)):
print(abc[d])

d: Random variable name for index
range: range of number to iterate through
len: provides the range of numbers to iterate through by dynamically returning the list’ length

Each print statement prints a list’s element by accessing its index.

This way of writing for loops is far more effective than the original one at the top, because in our programs we often depend or need the individual indices of element more than the elemens’ values.

#python #for #loops