Text16. Дан текстовый файл. Удалить из него все пустые строки.

Решение на Python 3:

# -*- coding: utf-8 -   *-
import random
import shutil
import string
import os

file1 = "text16.txt"
print("Read from:",file1)

K = random.randrange(1,20)
#K = 17
print("K = ",K)
n = 0
try:
    with open(file1, 'r') as infile:
        for line in infile:
            n += 1
            print(n,":",line,end="")
            
    #file for temporary data
    N = random.randrange(5,8)
    S = ''.join(random.choice(string.ascii_lowercase + string.ascii_uppercase \
        + string.digits) for _ in range(N))
    temp_file = "temp_" + S + ".txt"
    print()
    print("Temp file:",temp_file)
        
    shutil.copyfile(file1, temp_file)

    n = 0
    with open(file1, 'w') as outfile, open(temp_file, 'r') as infile:
        for line in infile:
            n += 1
            if line.strip("\n") != "":
                outfile.write(line)
                print(n,":",line,end="")

    try:
        os.remove(temp_file)
    except OSError as e:
        print("\nError:", e)

except IOError:
    print('Open error: ',file1)