Answer to Question #305881 in Python for Michael

Question

Write a python function Read_Prime(fname, list)  which takes a list of numbers as an input, use this number to write them in a file "primes.txt" . The function then read the file and return a list containing only prime numbers as shown in the example. Also, write the exception handling code to show the proper message.

 

Example-1

Example-2

Example-2

Input:

primes.txt

[1,2,3,4,5,6,7]

 

Output:

[1,2,3,5,7]

Input:

primes.txt

[3,6,5,13,18,21]

 

Output:

[3,5,13]

Input:

primes.txt

[2,4,6,8,10]

 

Output:

[2]

Answer 1

'''
    Write a python function Read_Prime(fname, list)  which takes a list of numbers as an input,
    use this number to write them in a file "primes.txt" .
    The function then read the file and return a list containing only prime numbers as shown in the example.
    Also, write the exception handling code to show the proper message.


Input:
primes.txt
[1,2,3,4,5,6,7]


Output:
[1,2,3,5,7]


Input:
primes.txt
[3,6,5,13,18,21]


Output:
[3,5,13]


Input:
primes.txt
[2,4,6,8,10]


Output:
[2]
'''


outfile  = open("prime.txt","w")
s = (str(input("Enter numbers separated by space: "))).split(" ")
nums = []
for r in range(0,len(s)):
    nums.append(int(s[r]))
    outfile.write("%d\n"%(nums[r]))
outfile.close()


outfile  = open("prime.txt","r")
s = (outfile.read()).split("\n")
outfile.close()


u=" "
for r in range(0,len(s)-1):
    t = int(s[r])
    Flag=1
    for c in range(2,t//2):
        if(t%c==0):
            Flag=0
    if(Flag): u = u + str(t) + " "
print("Output:",u)