Question

USING PYTHON IDLE 3.4:

Using Python List Comprehension and file functions, read the data from galaxies.txt and cycles txt into your Python program, combine the values and then save them to a new list. Each index in the list will contain the combinations from the data files. The resulting List will be the same as you produced for Lab Prep 7. As a reminder, List Comprehensions use the format: expression for variable in sequence if condition j (Recall that the if condition' portion of the List Comprehension is optional and only necessary if you are filtering or restricting the values in some way) Although you are writing and testing with a small dataset, your function should work with files containing any number of values. The final step of your program is to print a results message as well as the list of combined values

OUTPUT should look like this:

galaxies.txt

O
P
!
!
E
O
R
U
B
R
!
!
!
B
O
I
B
R
R
P
P
B
O
O
B
!
P
I
!
E
!
L
I
!
L
R
P
B
L
E
I
O
I
P
I
I
L
U
B
L
P
B
B
R
!
R
L
!
R
R
P
!
L
L
P
P
E
P
B
B
E
R
U
R
P
!
P
B
I
U
L
L
I
U
B
R
B
U
L
R
L
B
U
I
R
R
E
P
L
P

cycles.txt

8
4
4
10
8
10
8
4
10
4
8
2
4
8
8
8
8
8
4
2
2
4
10
2
6
6
10
10
2
4
4
10
6
6
2
2
8
10
8
2
8
8
2
8
8
2
10
8
8
4
8
6
2
2
8
4
4
8
4
10
8
10
2
8
8
2
4
2
10
2
8
8
8
8
4
4
4
8
10
10
8
8
6
2
8
6
8
10
8
10
2
8
10
8
8
8
6
8
8
10

Need help with this please! :( Need to use the List Comprehension format: [expression for variable in sequence if condition] as stated in introduction!

Answer 1

# labprep8.py

# Poonam R

# This is an optimization of an earlier Python file i/o program

# which program combines data from the BOOYA Observation Lab

def combineX():

    File1 = input("Enter FilenName for 1st file(like Galaxies.txt) : ")

    File2 = input("Enter FilenName for 2nd file(like cycles.txt) : ")

    print("The combineX() function analyzes BBOYa data")

    print("===========================================")

    print("Data from 2 files will be analyzed:")

    print("Report of BOOYA Radio Galaxy Observations")

   

    HandleFile1 = open(File1)

    HandleFile2 = open(File2)

    print("\nTwo files are opened")

   

    print("Reading from " + File1)

   

    lstFile1 = [line.strip() for line in HandleFile1]

   

    print("Reading from " + File2)

    HandleFile2 = open(File2)

    lstFile2 = [line.strip() for line in HandleFile2]

    return lstFile1,lstFile2

def main():

    specialchar = ['(', '\\', ')' ,'"',"'" ]

    lst1,lst2 = combineX()

   

    print("Removing the extra spaces and special character")

    lst1 = list(filter(("").__ne__, lst1))

    for symbol in specialchar:

        lst1 = list(filter((symbol).__ne__, lst1))

   

    lst2 = list(filter(("").__ne__, lst2))

    for symbol in specialchar:

        lst2 = list(filter((symbol).__ne__, lst2))

       

    print("Combinig two values and appended to the list")

    FinalList=(list(zip(lst1, lst2)))

   

    cnt=1

    for i in range(len(FinalList)):

        print(FinalList[i][0] + FinalList[i][1],end=' ')

        cnt=cnt+1

        if cnt>5:

            cnt=1

            print()

if __name__=='__main__':

    main()

Output Screenshot