Writing a Python Program to accept an input from a text file and figure out the distribution by hour of the day for each of the messages

fname= input("Enter a file name: ")   #We will use a variable to accept a text file
if len(fname)<1:                                            # if you do no want to enter any file name , we can set a default file name
    fname="mbox-short.txt"
op=open(fname)                                           #We then open that text file by using open keyword

lis=[]                                                                      #We will use a variable to define an empty list and empty dictionary
dic={}

 #We now run a For loop to go through each line in the text file. We want to  to ignore the first "From :" clause as it has an colon at the end which we do not want according to the exercise. 
                                                                                     
for line in op:                                                    
    if line.startswith('From:'):
        continue

  #We then use the 2nd If statement to run our main code which will first find the line starting  from "From" keyword , then we split the line . We then use indexing to find time in hours mins and seconds. To drill down further we split the time again by using : with split method. Then we use indexing again to pick out hour from the time which is [0] indexing.

    elif line.startswith('From'):
        x=line.split()
        y=x[5]
        z=y.split(':')
        m=z[0]
        #print(m)
                                           
        dic[m]=dic.get(m,0) + 1          #We then use the empty dictionary to create a counter using Get method. 

#print(dic)                                              # you can test your code till here by running this print command.

for k,v in dic.items():                        #Run a For loop to go through the dictionary and create a tuple(newtu).
    #print(k,v)
    newtu=(k,v)
    lis.append(newtu)                        #Use the empty list we created earlier to add the results of tuple in the list .
lis=sorted(lis)                                      #We can then sort the list as we need sorted results

#print(lis)

for k,v in lis:                                         #We then run another for loop to print out the results in the format needed.
    print(k,v)