Python - Loop Lists

Loop Through List Items

You can traverse the items in a list with Python's for loop construct. The traversal can be done, using list as an iterator or with the help of index.

Syntax

Python list gives an iterator object. To iterate a list, use the for statement as follows −

for obj in list:
   . . .
   . . .

Example

Take a look at the following example −

lst = [25, 12, 10, -21, 10, 100]
for num in lst:
   print (num, end = ' ')

Output

25 12 10 -21 10 100

Loop Through List Items with Index

To iterate through the items in a list, obtain the range object of integers "0" to "len-1". See the following example −

Example

lst = [25, 12, 10, -21, 10, 100]
indices = range(len(lst))
for i in indices:
   print ("lst[{}]: ".format(i), lst[i])

Output

lst[0]: 25
lst[1]: 12
lst[2]: 10
lst[3]: -21
lst[4]: 10
lst[5]: 100