import os

# create a file and write it to disk:

pathname = (os.getcwd() + "\\test\\")   # \\ is required because \ has special meaning to shell
filename = "test.dat"
# create some data:
done = 0
namelist = []
while not done:
    name = input("Enter a line:")
    print("The last line was: " + name)
    if name != "end":
        # append name and a line separator (os.linesep = '\n' in windows)
        print("if met, should append")
        namelist.append(name + os.linesep)
    else:
        print("else met, should break")
        done = 1
    print("Bottom of the while")

# Create a file object:
# in "write" mode (overwrites any pre-existing filename)
print("opening file")
FILE = open(pathname + filename,"w")

# Write all the lines at once:
FILE.writelines(namelist)

# Alternatively write them one by one:
for name in namelist:
    FILE.write(name)

FILE.close()