Just in case, if someone is looking for a similar problem...
Most solutions given here are one line and are quite readable and simple. Just wanted to add one more that does not need the use of lambda(I am assuming that you are trying to use lambda just for the sake of making it a one line code). Instead, you can use a simple list comprehension.
[print(i) for i in x]
BTW, the return values will be a list of Nones.
GeeksforGeeks
geeksforgeeks.org › python › python-iterating-with-python-lambda
Python: Iterating With Python Lambda - GeeksforGeeks
July 23, 2025 - # Iterating With Python Lambdas # list of numbers l1 = [4, 2, 13, 21, 5] l2 = [] # run for loop to iterate over list for i in l1: # lambda function to make square # of number temp=lambda i:i**2 # save in list2 l2.append(temp(i)) # print list ...
EyeHunts
tutorial.eyehunts.com › home › python lambda for loop | example code
Python lambda for loop | Example code - Tutorial - By EyeHunts
May 30, 2022 - Answer: Simply create a list of lambdas in a python loop using the following code. def square(x): return lambda: x * x lst = [square(i) for i in [1, 2, 3, 4, 5]] for f in lst: print(f()) ... Another way: Using a functional programming construct ...
Issue with creating lambda functions using for loop
If you want the function to take n from outer scope, don't put it in as a parameter. arr = [] for n in range(1,5): arr.append(lambda: 5+n) More on reddit.com
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February 7, 2022python - Lambda in a loop - Stack Overflow
You can also fix the scoping inside the lambda expression ... However in general this is not good practice as you have changed the signature of your function. ... Is this same problem that occurs with defining closures within for-loops using def, that in Python for-loops don't get their own scopes? 2020-04-07T02:35:01.52Z+00:00 ... @robbie_c An interesting behavior to support your first example... More on stackoverflow.com
Lambda vs For each loops
They're equivalent. The first one is probably slightly faster, but that would depend on optimizations. Something like int i = 0; for (String str : arrayOfStrings) { i += str.length; } you can't write as is with forEach, as you're not allowed to change variables in the enclosing method, but you could use streams for something equivalent. But not all cases are that simple and easily translated to streams. forEach mainly is useful if you just have a method or lambda you want to call for each item. objects.forEach(MyClass::update); is probably better than for (MyClass myObj : objects) { myObj.update(); } But this isn't always that easy. Sometimes you want to write beginner-friendly code and you might prefer the bottom variant because of that. Sometimes performance is extremely important and you might do performance tests and choose the fastest variant instead of the prettiest one. More on reddit.com
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December 30, 2018I still don't understand the benefit of lambda functions
they're just...functions with different syntax That's exactly what they are. The main syntactical difference between the two is that a regular function definition is a statement, whereas a lambda function definition is an expression. Lambda functions can therefore be defined and then passed to another function in one step, without having to go through a local name (that's also why lambda functions are sometimes called anonymous functions, they don't necessarily have a particular name). Lambda is a convenience feature to more easily define small, one-off functions. More on reddit.com
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January 23, 202202:42
python lambda for loop example - YouTube
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Loops In Python I While Loop | For Loops | Lambda Function | ...
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Lambda in a Loop is a Code Smell - YouTube
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PYTHON : Lambda in a loop - YouTube
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Python Tutorial #23; Lambda Functions - YouTube
11:26
Coffee Break Python Lambdas - How to use if-else and loops in a ...
Top answer 1 of 10
46
Just in case, if someone is looking for a similar problem...
Most solutions given here are one line and are quite readable and simple. Just wanted to add one more that does not need the use of lambda(I am assuming that you are trying to use lambda just for the sake of making it a one line code). Instead, you can use a simple list comprehension.
[print(i) for i in x]
BTW, the return values will be a list of Nones.
2 of 10
26
Since a for loop is a statement (as is print, in Python 2.x), you cannot include it in a lambda expression. Instead, you need to use the write method on sys.stdout along with the join method.
x = lambda x: sys.stdout.write("\n".join(x) + "\n")
Caisbalderas
caisbalderas.com › blog › iterating-with-python-lambdas
Iterating With Python Lambdas - Carlos Isaac Balderas
[v * 5 for v in x] --> map(lambda for v: v * 5, in x) --> map(lambda v : v * 5, x) A slightly more difficult example. The for loop representation is straightforward; iterate over x, multiply the odd values by 5 and add them to the list y.
OpenGenus
iq.opengenus.org › python-lambda-for-loop
Python lambda for loop
November 27, 2022 - The trick is to write for loop in one line expression which can be done as follows: ... As this is a one line expression, we can directly include this in a lambda. Following Python code traverses through a list of integers using lambda which in turn uses for loop:
Finxter
blog.finxter.com › home › learn python blog › python for loop inside lambda
Python For Loop Inside Lambda - Be on the Right Side of Change
June 13, 2021 - The following question is a classic ... execute this code in our console to find out what happens! y = "hello and welcome" x = y[0:] x = lambda x: (for i in x : print i)...
Delft Stack
delftstack.com › home › howto › python › use lambda functions alongside a for loop
How to Use Lambda Functions With the for Loop in Python | Delft Stack
February 9, 2025 - For loops can be used to iterate over other sequences such as tuples, strings, dictionaries, and sets. Although lambda functions can only have one expression, there are no restrictions on the data types that can be used. The example below illustrates how we can iterate over a list of strings using a for loop and a lambda function.
Mimo
mimo.org › glossary › python › lambda-function
Python Lambda Function: Syntax, Usage, and Examples
For loops allow applying a lambda function to multiple values sequentially. Python supports functional programming, where functions can be passed as arguments or returned from other functions.
TutorialsPoint
tutorialspoint.com › How-to-create-a-lambda-inside-a-Python-loop
How to create a lambda inside a Python loop?
The most straightforward approach is to use a helper function that returns a lambda ? def square(x): return lambda: x*x list_of_lambdas = [square(i) for i in [1, 2, 3, 4, 5]] for f in list_of_lambdas: print(f())
Oreate AI
oreateai.com › blog › lambda-functions-in-pythons-for-loop › f7c048d605a8d77224ef8d0cfe83a413
Lambda Functions in Python's for Loop - Oreate AI Blog
December 22, 2025 - Alternatively, if we change it so that 'x' replaces 'i', it becomes independent from passed values: f = [lambda: i * i for i in range(4)] f[0]() # Returns 9 (3*3) f[1]() # Returns 9 (3*3) f[2]() # Returns 9 (3*3) f[3]() # Returns 9 (3*3)
Finxter
blog.finxter.com › home › learn python blog › python one line for loop lambda
Python One Line For Loop Lambda - Be on the Right Side of Change
July 23, 2020 - The simple formula is [expression + context]. ... Context: What elements to select? The context consists of an arbitrary number of for and if statements. The example [x for x in range(3)] creates the list [0, 1, 2].
DEV Community
dev.to › rossli › way-to-better-explain-python-lambda-in-for-loop-1mp8
Way to BETTER explain Python lambda in for loop. - DEV Community
November 6, 2023 - def lambda_generator(): itr = iter(range(5)) # Apply `iter()` to range object to get iterator `itr` while True: try: def lambda_function(x): return x + next(itr) # `next(iter)` is the `i` print(lambda_function(0)) # Set `x` to be 0, so that the printed result = next(itr) except StopIteration: yield lambda_function break # This break may not be necessary though · In every while loop (before StopIteration), next(itr) is called, modifying the itr iterator outside the while loop (inside the lambda_generator() function).
IncludeHelp
includehelp.com › python › iterating-with-python-lambda.aspx
Iterating with Python Lambda
# Python program to demonstrate the example to # iterate with lambda # list of integers numbers = [10, 15, 20, 25, 30] # list to store cubes cubes = [] # for loop to iterate over list for x in numbers: # lambda expression to find cubes res = lambda x: x**3 # appending to the list (cubes) ...
Medium
medium.com › @allenbalif › loops-in-python-i-while-loop-for-loops-lambda-function-ceb0f510abe4
Loops In Python I While Loop | For Loops | Lambda Function | by Allen Balif | Medium
January 26, 2024 - For example, a while loop can be used to find the factorial of a number, as long as the input is positive: For Loop: The for loop in Python is used to iterate over a sequence (such as lists, tuples, dictionaries, etc.) or other iterable objects. It’s structure is as follows: ... Lambda Function: Lambda functions, also known as anonymous functions, are small, anonymous functions defined using the lambda keyword.
Reddit
reddit.com › r/learnpython › issue with creating lambda functions using for loop
r/learnpython on Reddit: Issue with creating lambda functions using for loop
February 7, 2022 -
Hey all,
Can someone explain why when I run the below code:
arr = []
for n in range(1,5):
arr.append(lambda n: 5+n)
I can't run one of the functions in the array by simply calling arr[0]()with empty parenthesis?
it throws an error saying I need to pass one positional argument, n - but I'm passing it using for loop, am I not?
There is evidently something I'm missing.
What makes it worse to me is that ok, if I pass an argument, say I will call art[0](7) - that makes the n in my lambda and in for loop useless, because the value (of n) didn't get passed at all to that lambda n: definition...
Any help would be appreciated!
Top answer 1 of 4
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If you want the function to take n from outer scope, don't put it in as a parameter. arr = [] for n in range(1,5): arr.append(lambda: 5+n)
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Nothing passes n into the lambda. Just because the variable exists, does not mean it gets passed into the lambda function. You'd instead want: arr.append(n + 5) # no lambda required Where you'd want a lambda is where a function call happens, like when using the key argument for the sort function. arr.sort(key=lambda e: 0 - e) In the above case, sort knows to call the function specified by the key argument.
Srinimf
srinimf.com › 2022 › 05 › 30 › amazing-fact-why-cant-we-use-for-in-python-lambda
The Amazing Fact Why Can’t We use Loops in Python Lambda
November 19, 2022 - Python lambda doesn’t support loops. The syntax of it says it supports arguments and expression. Below are the examples that describe the fact that why we can’t use Loops.
W3Schools
w3schools.com › python › python_lambda.asp
Python Lambda
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Practice Problems Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Training ... A lambda function is a small anonymous function.
DevGenius
blog.devgenius.io › comparison-between-the-use-of-for-loop-and-apply-lambda-in-terms-of-speed-space-and-44c47ed4c1fb
An analysis of the effectiveness of ‘for loop’ and ‘apply lambda’ in terms of speed, space usage, and maintainability. | by Revalde Raditya | Dev Genius
May 7, 2023 - The number dataset contains several numbers, and the for loop creates a new variable named ‘num’ that saves each value in the dataset one by one. After the loop, the program prints the ‘num’ variable, resulting in the printing of every value saved inside ‘num’. ‘apply lambda’ can be considered a more advanced method of performing iteration in Python.
Codecademy
codecademy.com › forum_questions › 51617d5b0f2389811b00460e
Can we Use Loops such as for and while inside a lambda function???? | Codecademy
The one i tried and failed message=filter(lambda x: for i in x: if x!=’X’, garbled) print message · The above returned an Invalid syntax error pointing at the for loop!!
Top answer 1 of 4
125
You need to bind d for each function created. One way to do that is to pass it as a parameter with a default value:
lambda d=d: self.root.change_directory(d)
Now the d inside the function uses the parameter, even though it has the same name, and the default value for that is evaluated when the function is created. To help you see this:
lambda bound_d=d: self.root.change_directory(bound_d)
Remember how default values work, such as for mutable objects like lists and dicts, because you are binding an object.
This idiom of parameters with default values is common enough, but may fail if you introspect function parameters and determine what to do based on their presence. You can avoid the parameter with another closure:
(lambda d=d: lambda: self.root.change_directory(d))()
# or
(lambda d: lambda: self.root.change_directory(d))(d)
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This is due to the point at which d is being bound. The lambda functions all point at the variable d rather than the current value of it, so when you update d in the next iteration, this update is seen across all your functions.
For a simpler example:
funcs = []
for x in [1,2,3]:
funcs.append(lambda: x)
for f in funcs:
print f()
# output:
3
3
3
You can get around this by adding an additional function, like so:
def makeFunc(x):
return lambda: x
funcs = []
for x in [1,2,3]:
funcs.append(makeFunc(x))
for f in funcs:
print f()
# output:
1
2
3
You can also fix the scoping inside the lambda expression
lambda bound_x=x: bound_x
However in general this is not good practice as you have changed the signature of your function.