#讀取數據後的數據寫入了out_file變量，是哪一步完成了將數據寫入to_file中呢？
#
from sys import argv
from os.path import exists
script, from_file, to_file = argv
print(f"Copping from {from_file} to {to_file}")
#we could do these two on one line, how?
in_file = open(from_file)
in_data = in_file.read()
print(f"The input file is {len(in_data)} bytes long")
print(f"Does the output file exists? {exists(to_file)}")
print("Ready, hit RETURN to continue, CTRL-C to abort.")
input()
out_file = open(to_file, 'w')
out_file.write(in_data)
print("Alright, all done")
in_file.close()
out_file.close()
