Turn function into a lambda function

Question

I have a variables that I am trying to turn into a lambda function but I am struggling to get the input variable to work in the lambda expression.

My variables are:

function_name = 'add'
inpt = 'a,b,c'

and I want the output to be abc * 5 (a,b,c,a,b,c,a,b,c). However it is important that I use the variables rather than simply typing this.

I have tried to use a dictionary as such:

my_dict = {}
my_dict[function_name] =lambda inpt: inpt*5

However the output is a lambda function and I still have to manually enter the value of inpt instead of it taking the variable.

I am fairly new to programming so I may have misunderstood how the lambda function works. Any help would be appreciated.

HI geds, Can you post your whole lambda function (I guess you are talking about aws lambda)? — zip
– zip, Commented Dec 1, 2019 at 23:15
Show how you want to use the function. You want to supply the data when the function is created instead of called? — Carcigenicate
– Carcigenicate, Commented Dec 1, 2019 at 23:18
Are you looking for the following a lambda like this lambda: inpt*5? It almost seems like you do not even need to give it a parameter. — James Mchugh
– James Mchugh, Commented Dec 1, 2019 at 23:29

Carcigenicate · Accepted Answer · 2019-12-01 23:29:56Z

1

Just don't give the lambda a parameter:

function_name = 'add'
inpt = 'a,b,c'

my_dict = {}
my_dict[function_name] = lambda: inpt * 5  # Don't say that the lambda takes a inpt argument

>>> my_dict[function_name]()  # Now we don't need to supply that here
'a,b,ca,b,ca,b,ca,b,ca,b,c'

I'll note that the output isn't technically correct, but that's not the main point here. You could try using ", ".join on a list of ['a', 'b', 'c'] after using list multiplication to get a better result.

answered Dec 1, 2019 at 23:29

Carcigenicate

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7 Comments

geds133 Over a year ago

Brilliant thanks, this is what I needed. One other thing, is there anyway that I am able to print this function in a single line as well e.g. add = lambda: a,b,c * 5

Carcigenicate Over a year ago

@geds133 What do you mean "print this function"? print(my_dict[function_name]())?

geds133 Over a year ago

So I recieve the output there a,b,ca,b,ca,b,ca,b,ca,b,c, whereas I want to able to print a string in the format add = lambda: a,b,c * 5

Carcigenicate Over a year ago

@geds133 You want to print out the literal source code?

Carcigenicate Over a year ago

@geds133 getsource, although you probably shouldn't need to use that beyond debugging and a few other corner scenarios.

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user20224206 · Accepted Answer · 2022-10-12 16:24:48Z

0

inpt = 'a,b,c'
func = lambda inpt: ''.join(inpt.split(','))
d = tuple(func(inpt*5))

answered Oct 12, 2022 at 16:24

user20224206

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