# Open a file with mode "r" for read and returns a file object.
f = open("infile_1.py", "r")
# the content of the file object is read and used but not kept.
print(f.read())  

print(f"""The second read() returns "". 
The file content can be read only once.
print(f.read())
""")
print(f.read())
f.close()