Problem reading a written file on Android on QPython (python3).

Question

I wrote a small program while learning about file.write, and while it writes to the file (I found it with a file manager), the print() doesn't print anything when I run it in the QPython terminal.

file1 = open("test1.txt", "a+")
file1.write("Ayyyy, it worked!")
cont = file1.read()
print(cont)
file1.close()

Any idea why?

Answer 1

I changed it a little and now it works:

file1 = open("test1.txt", "a+")
file1.write("Ayyyy, it worked!")
file1 = open("test1.txt", "r")
cont = file1.read()
print(cont)
file1.close()

maybe a+ is no good for reading from the start.

Answer 2

Konoha Tomono-Duval No, .read call dont reopened in write mode ("a+" mode is for append mode with read support). Like i said before, you trying to read at end of file, for this .read return an empty string. Like my previous hint you can simply do:

import os

file1 = open("test1.txt", "a+")
file1.write("Ayyyy, it worked!")

# this set the current file
# "pointer" to beginning
file1.seek(0, os.SEEK_SET)

cont = file1.read()
print(cont)
file1.close()

and all its fine

Answer 3

Konoha Tomono-Duval Your problem is that you try to read at end of file (then read return empty). You have 2 option:

1) Close and reopen file for reading

2) Use seek method for read from start. At example by putting this line after .write

file1.seek(0, os.SEEK_SET)

This line set the internal file pointer to beginning of file allowing you to read from start

Answer 4

Tried Paul's method, and it worked. I guess that a+ doesn't read, or maybe the file1.read reopened it in write mode and deleted the contents. Thanks, y'all!