Python: Fastest way to write large integer to file

Question

I want to write a really large integer from Python to a textfile, about 10 to 1000 Megabyte.

The following options have the same speed, unfortunately both are really slow:

import time
import pickle

num = 17**(10**7)

t1=time.time()
pickle.dump( num , open( "save2.p", "wb" ) )
t2=time.time()
print(str(t2-t1))

t3=time.time()
file = open("testfile2.txt","w") 
file.write(str(num))
file.close()
t4=time.time()
print(str(t4-t3))

(of course, the value of num is just a placeholder for another big integer)

My questions:

1. Is there a faster way to write a human-readable file with the decimal digits?
2. If not, how can I write it faster without human-readability?

Who can help?

Answer 1

Try this:

import random

f=open("filename.txt","w")
char=""
ints=["0","1","2","3","4","5","6","7","8","9"]
for i in range(10**10): #Ten to the power of ten
  char+=random.choice(ints)
if char.startswith("0"):
  char=char[1:]
f.write(char)
f.close()

If you want to read the integer, you write this:

myInt=int(open("filename.txt","r").read())

Hope this helps!