python for

In Python, the for loop is used to iterate over a sequence of elements, such as a list, tuple, string, or even a range of numbers. It allows you to perform a set of operations on each element of the sequence. Here’s the basic syntax of a for loop in Python:

pythonCopy codefor variable in sequence:
    # code to be executed for each element in the sequence

• variable is a temporary variable that takes on the value of each element in the sequence during each iteration.
• sequence is the collection of elements you want to iterate over.

Here are some examples of how you can use the for loop in Python:

1. Iterating over a list:

pythonCopy codefruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

Output:

Copy codeapple
banana
cherry

2. Iterating over a string:

pythonCopy codeword = "Python"
for letter in word:
    print(letter)

Output:

cssCopy codeP
y
t
h
o
n

3. Using the range function to iterate over a range of numbers:

pythonCopy codefor num in range(1, 6):
    print(num)

Output:

Copy code1
2
3
4
5

4. Iterating over a dictionary’s keys or values:

pythonCopy codeperson = {"name": "Alice", "age": 30, "city": "New York"}

# Iterate over keys
for key in person:
    print(key)

# Iterate over values
for value in person.values():
    print(value)

Output (keys):

Copy codename
age
city

Output (values):

sqlCopy codeAlice
30
New York

5. Using enumerate to iterate over a sequence with both index and value:

pythonCopy codefruits = ["apple", "banana", "cherry"]
for index, fruit in enumerate(fruits):
    print(f"Index {index}: {fruit}")

Output:

yamlCopy codeIndex 0: apple
Index 1: banana
Index 2: cherry

The for loop is a fundamental construct in Python for performing repetitive tasks, and it’s a powerful tool for working with collections of data. You can use it to process elements in a sequence, make decisions based on those elements, and perform various operations as needed.