Python 文件

1. 新建文件 pi_digits.txt 及内容：

3.1415926535
  8979323846
  2643383279

1. 读取整个文件

with open("pi_digits.txt") as file_object:
    contents = file_object.read()
    print(contents.rstrip())

2. 逐行读取

filename = 'pi_digits.txt'

with open(filename) as file_object:
    for line in file_object:
        print(line.rstrip())

3. 将文件各行内容读入列表

filename = 'pi_digits.txt'

with open(filename) as file_object:
    lines = file_object.readlines()


pi_string = ""

for line in lines:
    pi_string += line.strip()

print("pi_string ", pi_string, "length is:", len(pi_string))

实例输出结果：

实例输出结果

4. 圆周率值中前一百万位中是否包含你的生日

filename = 'pi_million_digits.txt'

with open(filename) as file_object:
    lines = file_object.readlines()

pi_string = ""

for line in lines:
    pi_string += line.strip()

birthday = input("Enter your birthday, in the form mmddyy: ")

if birthday in pi_string:
    print("Your birthday appears in the first million digits of pi!")
else:
    print("Your birthday does not appear in the first million digits of pi.")

5. 写入文件

filename = 'programming.txt'

with open(filename, 'w') as file_object:
    file_object.write("I love programming 1.\n")
    file_object.write("I love programming 2.")

6. 附加到文件

filename = 'programming.txt'

with open(filename, 'a') as file_object:
    file_object.write("I love programming 1.\n")
    file_object.write("I love programming 2.\n")

本文参考自 《Python 编程：从入门到实践》