Problem with python

Question

I created file with text and want to add another text, but it shows me number, why?

my=open('my.txt', 'w')
my.write('pervaya stroka')
my=open('my.txt')
with open('my.txt') as my_new_file:
contents=my_new_file.read()
print(contents)
with open('my.txt', 'a') as f:
new=f.write('vtoraya stroka')
print(new)

So it shows me the first text, but when i add the other one, it shows me 14
Where is the problem?

Answer 1

Some issues in the code, that can result in problems. Find some comments in the code.
if you open a file and don't close it correctly, all the content of the file can get lost.

my=open('my.txt', 'w')
my.write('pervaya stroka')
my.close() # file has to be closed after using it, except you use "with open ..."
#my=open('my.txt') # not used
with open('my.txt') as my_new_file:
contents=my_new_file.read()
print(contents)
with open('my.txt', 'a') as f:
new=f.write('vtoraya stroka')
print(new) # prints the number of characters written to the file

Answer 2

You are printing the return from the write function, which return the length of the string you wrote,
Instead you should open it after appending the value in read mode then print it

Answer 3

my=open('my.txt', 'w')
my.write('pervaya stroka ')
my.close()
with open('my.txt', 'a') as f:
f.write('vtoraya stroka')
with open('my.txt') as my_new_file:
new=my_new_file.read()
print(new)

Answer 4

Because you are reading the file two times one after wrting the first line and the second after appending. Remove the part for reading and printing the first time.

Answer 5

Oh, thank you very much!
But now it prints
Pervaya stroka
Pervaya stroka vtoraya stroka

So why it duplicate the first text?

Answer 6

Ooooooo, i see
Thank you)
It works)