File

f = open('test.txt', 'w')
f.write('test')
# 아래도 가능하다.
# print('I am print', 'Mike', file=f, sep='#')
f.close()

with open('test.txt', 'w') as f:
    f.write('test\n')
    
####################################################################    
with open('test.txt', 'r') as f:
	all = f.read()
    # f.read(2) # 2 bytes 만 읽어옴
print(all)    # with 문 밖에서도 all 참조 가능 !!!

# 라인 단위로 읽기
with open('test.txt', 'r') as f:
    while True:
        line = f.readline().strip()
        print(line)

        if not line:
            break    

with open('robot.txt', 'r') as f:
    lines: list[str] = f.readlines()
    for l in lines:
        print(l.strip())

####################################################################    
# 쓰기 / 읽기 모드로 파일 열기
s = """\
AAA
BBB
CCC
DDD
"""

# 쓰고 나서 읽기
with open('test.txt', 'w+') as f:
    f.write(s)
    f.seek(0)
    print(f.read())
    
# 읽고 나서 쓰기    
with open('test.txt', 'r+') as f:
    print(f.read())
    f.write(s)