Looping in Python: For Loops and While Loops
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Looping in Python: For Loops and While Loops
Looping is a fundamental concept in Python programming that allows developers to execute a block of code repeatedly, saving time and reducing code redundancy. Python supports two primary types of loops: for loops and while loops. Each is used for different scenarios but serves the same core purpose—automating repetitive tasks.
For Loops in Python
A for loop is typically used when you have a known sequence (like a list, tuple, or range) and you want to iterate over each element.
Syntax:
python
for item in sequence:
# code block
Example:
python
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
print(fruit)
You can also use the range() function to loop a specific number of times:
python
for i in range(5):
print(i)
This prints numbers from 0 to 4. range() is commonly used for numeric loops and can accept start, stop, and step arguments.
While Loops in Python
A while loop is used when the number of iterations is not known in advance. It runs as long as a condition is True.
Syntax:
python
while condition:
# code block
Example:
python
count = 0
while count < 5:
print(count)
count += 1
This will continue looping until count becomes 5.
Breaking and Continuing
You can control loop execution with:
break: Exits the loop immediately.
continue: Skips the current iteration and moves to the next.
Example with break:
python
for i in range(10):
if i == 5:
break
print(i)
Example with continue:
python
for i in range(5):
if i == 2:
continue
print(i)
Infinite Loops
Be cautious with while loops, as improper conditions may lead to infinite loops.
python
while True:
print("This will run forever unless stopped!")
Conclusion
Understanding and using for and while loops effectively is crucial for any Python developer. Whether you're processing data, automating tasks, or building complex logic, loops help write cleaner, more efficient code. Practice using them in different scenarios to master their power!
Keywords: Python loops
for loop in Python
while loop in Python
Python iteration
break and continue
infinite loop in Python.
Read More
Python Lists, Tuples, Sets, and Dictionaries Explained
Python Conditional Statements (if, elif, else)
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