What can I do to add a list and sort out all the prime numbers in the list? Python 3-CodePudding

I am creating a program that

accepts an inputted list
finds all the prime numbers and only displays them.

I tried many different methods, many derived from existing prime filters, but they have hardcoded lists rather user-inputted ones.

I just can't seem to get a filter working with inputting a list, then filtering the prime numbers.

my_list = input("Please type a list")

list(my_list)

prime=[]
for i in my_list:
    c=0
    for j in range(1,i):
        if i%j==0:
            c =1
    if c==1:
        prime.append(i)
return (prime)

CodePudding user response：

When you get input, you're getting a string. You can't cast a string to a list immediately. Maybe you can request the user to use a separator between the numbers then use split method and cast strings to integers like this:

my_list = input("Please enter the list of numbers and use space seperator")

s_list = my_list.split()

cast_list = [int(num) for num in s_list]

Then, you can work on your prime number task based on your preferred algorithm.

CodePudding user response：

Not sure what your c variable is for, current_number? Your loop returns 'str' object cannot be interpreted as an integer for me. I have used len(my_list) to get the length for the loop.

range() defines as range(start, stop, step) - learn more - it accepts integers and parameters are partially optional.

I copied the code from https://www.codegrepper.com/code-examples/python/how to find prime numbers in list python

my_list = input("Please type a list")

primes = []

for i in range(0, len(my_list)):

    for j in range(2, int(i ** 0.5)   1):
        if i%j == 0:
            break
    else:
        primes.append(i)

print(primes)

More helpful resources from SO: Python function for prime number

I hope this helps.