python 读写文件

#写入内容到文件
from sys import argv

script,filename = argv

print(f"找到我们的{filename}文件")
print("正在打开文件")
target = open(filename,‘w‘)
print("正在清理文件内容")
target.truncate()

print("现在输入写入每一行的内容")

line1 = input("line1:")
line2 = input("line2:")
line3 = input("line3:")

print("把你的内容写入文本")

target.write(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)

print("正在关闭文件")
target.close()

#文件复制
from os.path import exists
out1 = input("输入复制源文件：")
out2 = input("输入复制目的文件：")
if exists(out1):
    out1_file = open(out1)
    file_data = out1_file.read()
    out1_file.close()
else:
    print(f"{out1}文件不存在")

if exists(out2):
    out2_file = open(out2,‘w‘)
    out2_file.write(file_data)
    out2_file.close()
else:
    print(f"{out2}文件不存在")

#一个文件内容复制到另一个文件
from sys import argv
from os.path import exists
script,from_file,to_file = argv
print(f‘从{from_file}复制到{to_file}‘)
in_file = open(from_file)
indata = in_file.read()
print(f"这个文件的的字节长度是{len(indata)}")
print(f"输出文件是否存在：{exists(to_file)}")
out_file = open(to_file,‘w‘)
out_file.write(indata)
print(‘关闭所有文件‘)
out_file.close()
in_file.close()