python测试一

"""
2，写函数，检查获取传入列表或元组对象的所有奇数位索引对应的元素，并将其作为新列表返回给调用者。
"""


def nmber(ob_j):

    a = [ob_j[i] for i in range(len(ob_j)) if not i % 2 == 0]

    return a


list = [0, 1, 2, 3, 4, 5, 6, 7, 8]


b=nmber(list)

print(b) #[1, 3, 5, 7]

"""

3，写函数，判断用户传入的对象（字符串、列表、元组）长度是否大于5。
"""

def send(str, lis, tupe):
    if len(str) > 5:
        print("大于5")

    if len(lis) > 5:
        print("大于5")

    if len(tupe) > 5:
        print("大于5")


a = "ashjdhajd"
b = [1, 2, 3,]
c = (1, 2, 3, 4, 5, 6)

send(a, b, c)

def funtion(ob_j):
    if len(ob_j) > 2:
        return ob_j[0:2]


li = [1, 2, 3, 4, 5, 6, 7]
print(funtion(li))

# 定义数字，字母，空客变量
# 便利穿进来的字符串
# 判断字符式什么累加变量
# 返回结果


def funtion(ob_j):
    nubmber = 0  # 数字
    blank = 0  # 空客
    other = 0  # 其他
    Letter = 0  # 字母

    for s in range(0,len(ob_j)):
        if ob_j[s].isalpha():  # 判断是否为全为字母
            Letter += 1
        elif ob_j[s].isdigit():  # 判断是否为数字
            nubmber += 1

        elif ob_j[s].isspace():  # 判断是否为空客
            blank += 1
        else:
            other += 1
    return "该字符串中数字有%d个,字母%d个,空格%d个,其他的%d个." % (nubmber, Letter, blank, other)


a = "hhhasd55 45212"

print(funtion(a))

def size(x, y):
    add = lambda x, y: x > y
    a = add(x, y)
    if a:
        return x
    else:
        return y


print(size(4, 3))

dic = {"k1": "v1v1", "k2": [11, 22, 33, 44]}


def size2(dic):
    a = [v[:2] for i, v in dic.items() if len(v) > 2]

    return a
size2(dic)

def index(agx):
    dic={i:d for i,d in enumerate(agx)}
    return dic



a=[11,22,33]

print(index(a))

{0: 11, 1: 22, 2: 33}

import json


def login(name, gender, age, education):
    dic = {}
    dic["name"] = name
    dic["gender"] = gender
    dic["age"] = age
    dic[‘education‘] = education

    with open("./student_msg.txt", "a+", encoding="utf8") as f:
        json.dump(dic, f, ensure_ascii=False)


name = "wang"
age = 18
gender = "nv"
education = "大学"

login(name=name, age=age, gender=gender, education=education)

import json


def login(name,age, education,gender="男"):
    dic = {}
    dic["name"] = name
    dic["gender"] = gender
    dic["age"] = age
    dic[‘education‘] = education

    with open("./student_msg.txt", "a+", encoding="utf8") as f:
        json.dump(dic, f, ensure_ascii=False)


while True:
    quet = input("Q/q退出")
    if quet.upper() == "Q":
        break
    name = input("name")
    age = input("age")
    gender = input("gender")
    print(type(gender),gender)
    education = input("education")

    if gender:
        login(name=name, age=age, gender=gender, education=education)
    else:
        login(name=name, age=age, education=education)

# def new_flie_content(name,old_content,new_content):
#     """
#     :param name:修改的文件名
#     :param old_content: 要修改的内容
#     :param new_content: 添加的内容
#     :return:
#     """
#     file_data=""
#     # r 已只读的方式取打开文件，文件指针放在文件开头
#     with open(name,"r",encoding="utf-8") as  f :
#         for lien in f:
#             if old_content in lien:
#                 lien=lien.replace(old_content,new_content)
#
#             file_data+=lien
#
#
#     with open(name,"w",encoding="utf8") as f:
#         f.write(file_data)
#
#
#
# new_flie_content("student_msg.txt","w","a")


"""
二、把原文件内容和要修改的内容写到新文件中进行存储的方式
"""

# def file_alter(file_nam,old_str,new_str):
#
#     """
#     :param file_nam:文件名
#     :param old_str: 旧内容
#     :param new_str: 新内容
#     :return:
#     """
#
#     with open(file_nam,"r",encoding="utf8") as f1,open("{}.bak".format(file_nam),"w",encoding="utf8") as f2:
#         for lien in f1:
#             if old_str in lien:
#                 lien =lien.replace(old_str,new_str) #Replace 函数使用另一个字符串替换字符串的指定部分指定的次数
#
#             f2.write(lien)
#
#
#
# file_alter("./student_msg.txt","18","19")

"""
# 2.2 python 使用正则表达式 替换文件内容 re.sub 方法替换
"""

import os, re


def alter(file, old_str, new_str):
    with open(file, "r", encoding="utf8")as f, open("%.bak".format(file), "w", encoding="utf8") as f2:
        """
        re.sub共有五个参数。
        其中三个必选参数：pattern, repl, string
        两个可选参数：count, flags
        pattern，表示正则中的模式字符串，
        repl，就是replacement，被替换，的字符串的意思。
        string，即表示要被处理，要被替换的那个string字符串。
        """

        for line in f:
            f2.write(re.sub(old_str, new_str, line))

        # 删除原文件名
    os.remove(file)
    # 创建源文件名（内容是修改的）
    os.rename("%s.bak" % file, file)
    """
    os.rename(src, dst)
    src -- 要修改的目录名
    dst -- 修改后的目录名      
    """
alter("student_msg.txt", "aang", "tang")