In this Python tutorial for beginners, we'll learn about For Loops in Python: Syntax of For Loop, Variable Name in For Loop, Looping through a Dictionary, Nested For Loops
1:09 Syntax of For Loop
3:03 Variable Name in For Loop
3:28 Looping through a Dictionary
6:21 Nested For Loops
A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).
This is less like the for keyword in other programming languages, and works more like an iterator method as found in other object-orientated programming languages.
With the for loop we can execute a set of statements, once for each item in a list, tuple, set etc.
Print each fruit in a fruit list:
fruits = ["apple", "banana", "cherry"] for x in fruits: print(x)
The for loop does not require an indexing variable to set beforehand.
Even strings are iterable objects, they contain a sequence of characters:
Loop through the letters in the word "banana":
for x in "banana": print(x)
With the break statement we can stop the loop before it has looped through all the items:
Exit the loop when
x is "banana":
fruits = ["apple", "banana", "cherry"] for x in fruits: print(x) if x == "banana": break
Exit the loop when
x is "banana", but this time the break comes before the print:
fruits = ["apple", "banana", "cherry"] for x in fruits: if x == "banana": break print(x)
With the continue statement we can stop the current iteration of the loop, and continue with the next:
Do not print banana:
fruits = ["apple", "banana", "cherry"] for x in fruits: if x == "banana": continue print(x)
To loop through a set of code a specified number of times, we can use the range() function,
The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.
Using the range() function:
for x in range(6): print(x)
Note that range(6) is not the values of 0 to 6, but the values 0 to 5.
The range() function defaults to 0 as a starting value, however it is possible to specify the starting value by adding a parameter: range(2, 6), which means values from 2 to 6 (but not including 6):
Using the start parameter:
for x in range(2, 6): print(x)
The range() function defaults to increment the sequence by 1, however it is possible to specify the increment value by adding a third parameter: range(2, 30, 3):
Increment the sequence with 3 (default is 1):
for x in range(2, 30, 3): print(x)
else keyword in a
for loop specifies a block of code to be executed when the loop is finished:
Print all numbers from 0 to 5, and print a message when the loop has ended:
for x in range(6): print(x) else: print("Finally finished!")
else block will NOT be executed if the loop is stopped by a
Break the loop when
x is 3, and see what happens with the
for x in range(6): if x == 3: break print(x) else: print("Finally finished!")
A nested loop is a loop inside a loop.
The "inner loop" will be executed one time for each iteration of the "outer loop":
Print each adjective for every fruit:
adj = ["red", "big", "tasty"] fruits = ["apple", "banana", "cherry"] for x in adj: for y in fruits: print(x, y)
for loops cannot be empty, but if you for some reason have a
for loop with no content, put in the
pass statement to avoid getting an error.
for x in [0, 1, 2]: pass
Welcome to my Blog, In this article, we will learn python lambda function, Map function, and filter function.
Lambda function in python: Lambda is a one line anonymous function and lambda takes any number of arguments but can only have one expression and python lambda syntax is
Syntax: x = lambda arguments : expression
Now i will show you some python lambda function examples:
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Utilized by the best
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Massive community support
Python has a steadily developing community that offers enormous help. From amateurs to specialists, there's everybody. There are a lot of instructional exercises, documentation, and guides accessible for Python web development solutions.
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Get started with Python!
In this Python tutorial, we will keep learning about repetition structures in Python.
You will understand how and when While Loops should be used. We will also cover the concept of infinite loop.
The break and continue statements will also be explained, they are used to control the execution flow of any repetition structure in Python.
For Loop Video: https://www.youtube.com/watch?v=XTisXBSH7kQ&feature=youtu.be
Playlist: Beginner Python Tutorials | Video #9
Access the code here: https://github.com/rscorrea1/youtube.git
0:00 - Video summary
0:20 - While loop
6:54 - Infinite loop
8:29 - Break statement
9:57 - Continue statement
Photo by Mario Ho on Unsplash
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A Python tutorial to understand the uses of for loop in various ways including examples.
Python is a general-purpose programming language, which emphasizes making programming easy, efficient coding, and unleashes the user’s potential. Loops are the vital part of programming as it allows the user to repetitive use a set of codes using loops. So in the following article, we will see how to use
for loops in python.
Till the iteration of the last item in the sequence, for loop run the instructions. It iterates over sets of instructions in sequence, arrays, and a tuple for a pre-defined period or until the last item and calculation are executed.
For loop can be categorized in three ways.
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This course will give you a full introduction into all of the core concepts in python. Follow along with the videos and you’ll be a python programmer in no time!
⭐️ Contents ⭐
⌨️ (0:00) Introduction
⌨️ (1:45) Installing Python & PyCharm
⌨️ (6:40) Setup & Hello World
⌨️ (10:23) Drawing a Shape
⌨️ (15:06) Variables & Data Types
⌨️ (27:03) Working With Strings
⌨️ (38:18) Working With Numbers
⌨️ (48:26) Getting Input From Users
⌨️ (52:37) Building a Basic Calculator
⌨️ (58:27) Mad Libs Game
⌨️ (1:03:10) Lists
⌨️ (1:10:44) List Functions
⌨️ (1:18:57) Tuples
⌨️ (1:24:15) Functions
⌨️ (1:34:11) Return Statement
⌨️ (1:40:06) If Statements
⌨️ (1:54:07) If Statements & Comparisons
⌨️ (2:00:37) Building a better Calculator
⌨️ (2:07:17) Dictionaries
⌨️ (2:14:13) While Loop
⌨️ (2:20:21) Building a Guessing Game
⌨️ (2:32:44) For Loops
⌨️ (2:41:20) Exponent Function
⌨️ (2:47:13) 2D Lists & Nested Loops
⌨️ (2:52:41) Building a Translator
⌨️ (3:00:18) Comments
⌨️ (3:04:17) Try / Except
⌨️ (3:12:41) Reading Files
⌨️ (3:21:26) Writing to Files
⌨️ (3:28:13) Modules & Pip
⌨️ (3:43:56) Classes & Objects
⌨️ (3:57:37) Building a Multiple Choice Quiz
⌨️ (4:08:28) Object Functions
⌨️ (4:12:37) Inheritance
⌨️ (4:20:43) Python Interpreter
📺 The video in this post was made by freeCodeCamp.org
The origin of the article: https://www.youtube.com/watch?v=rfscVS0vtbw&list=PLWKjhJtqVAblfum5WiQblKPwIbqYXkDoC&index=3
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