Python For Loop Index a for loop can iterate over any iterable object such as a list, tuple, dictionary, string, or even a range object.
The basic loop syntax is as follows:
for variable in iterable:
# code to be executed for each iteration
The variable in the loop is assigned the value of each element in the iterable object, one at a time, and the code inside the loop is executed for each iteration.
If you also need to access the index of the current element during each iteration of the loop, you can use the built-in enumerate() function. The enumerate() function returns an iterator that generates a tuple of (index, value) pairs for each element in the iterable.
Python For Loop Index Here is an example:
my_list = ['apple', 'banana', 'cherry']
for index, value in enumerate(my_list):
print(index, value)
Output:
0 apple
1 banana
2 cherry
In this example, the enumerate() function is used to generate (index, value) pairs for each element in the my_list list. The index variable receives the index of the current element, and the value variable receives the value of the current element.
Explain In Details Python For Loop Index Example.
Let’s take a closer look at iterating with a for loop and accessing the index of each element.
Suppose we have a list of names:
names = ['Alice', 'Bob', 'Charlie', 'David']
We can iterate over this list with a for loop like this:
for name in names:
print(name)
Output:
Alice
Bob
Charlie
David
In this loop, the variable name takes on the value of each element in the names list, one at a time, and the print() function is called for each iteration to print the value of name.
Now, let’s say we want to also print the index of each element in the list. We can use the built-in enumerate() function to achieve this:
for index, name in enumerate(names):
print(index, name)
Output:
0 Alice
1 Bob
2 Charlie
3 David
In this loop, the enumerate() function generates (index, name) pairs for each element in the names list. The index variable receives the index of the current element, and the name variable receives the value of the current element. The print() function is called for each iteration to print both the index and name values.
Note that the enumerate() function can also be used with other iterable objects, not just lists.
Python For Loop Index Here’s an example with a string.
message = 'Hello, world!'
for index, letter in enumerate(message):
print(index, letter)
Output:
0 H
1 e
2 l
3 l
4 o
5 ,
6
7 w
8 o
9 r
10 l
11 d
12 !
In this loop, the enumerate() function generates (index, letter) pairs for each character in the message string. The index variable receives the index of the current character, and the letter variable receives the value of the current character. The print() function is called for each iteration to print both the index and letter values.
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