Python包+模块：example 简记 黑马课程

 main

# -*- coding:utf8 -*-
"""
# editor: hjjdreamer
# create-time: 2022/12/3-16:57
# Python-Script: chapter9-1-module-example.py
# describe:
"""
import my_utils.str_util
from my_utils import file_util
from my_utils.file_util import append_to_file

print(my_utils.str_util.str_reverse("abcdefg12345678"))
print(my_utils.str_util.substr("abcdefgqreqrwqrqw", 0, 4))
print(my_utils.str_util.substr("abcdefgqreqrwqrqw", 1, 4))
print(my_utils.str_util.substr("abcdefgqreqrwqrqw", 2, 4))
print(my_utils.str_util.substr("abcdefgqreqrwqrqw", 3, 4))

print("\n")
file_util.print_file_info("./data/test_append.txt")  # 路径不要搞错
append_to_file("./data/test_append.txt", "qw,2015-06-09,45020,收入,正式")
file_util.print_file_info("./data/test_append.txt")

 

my_utils

file_util.py

# create-time: 2022/12/3-16:57
# Python-Script: file_util.py



def print_file_info(file_name):
    """
    :func 将给定路径的文件内容输出到控制台中
    :param file_name: 即将读取的文件路径
    :return: None
    """
    # 初始化参数
    f = None
    # 如果打开文件不存在则会报错
    try:
        f = open(file_name, "r", encoding="UTF-8")
        content = f.read()
        print(f"{file_name} content is following")
        print(content)
    except Exception as e:
        print(f"ERROR == REASON == {e}")
    finally:
        # 如果文件没有，则关闭文件回报错，因此需要添加一个判断
        if f:
            f.close()  # 有文件则关闭


def append_to_file(file_name, data):
    """
    :func 将数据追加到指定的文件中
    :param file_name: 指定的文件路径
    :param data: 指定的数据
    :return: None
    """
    f = open(file_name, "a", encoding="UTF-8")  # append 追加模式，有就追加，没有就创建
    f.write(data)
    f.write("\n")
    f.close()


if __name__ == "__main__":
    print_file_info("../data/bill.txt")
    print_file_info("../data/bill_computer.txt")

    print("\n===test append_to_file function===")
    append_to_file("../data/test_append.txt", "name,date,money,type,remarks1")

str_util.py

# -*- coding:utf8 -*-
"""

# create-time: 2022/12/3-16:57
# Python-Script: str_util.py
# describe:
"""


def str_reverse(s):
    """
    功能是字符串反转
    :param s: 被反转的字符串
    :return: 反转后的字符串
    """
    return s[::-1]  # 字符串反转


def substr(s, x, y):
    """
    功能是按照给定的下标完成对字符串的切片
    :param s: 将被切片的字符串
    :param x: 切片的开始下标
    :param y: 切片的结束下标
    :return: 切片完成后的字符串
    """
    return s[x:y]


if __name__ == "__main__":
    print("test str success")
    print(str_reverse("abcd1234"))
    print("substr test success (substr== abcd1234, 1, 3)")
    print(substr("abcd1234", 1, 3))

__init__.py