①
def func(a):l2 = []for i in range(len(a)):if i % 2 == 1:l2.append(a[i])return l2
print(func([1,2,3,4,5,6,7]))②
def baba(a):    #传完参数以后，现在的   a = [1,2,3,4,5,6,7,8,4,5,6,78,9,8]return a[1::2]   #对原列表进行切片形成一个新列表，将新列表返回给调用者
print(baba([1,2,3,4,5,6,7,8,4,5,6,78,9,8]))    #爸爸接受return返回的值

①
def func(a):return len(a) > 5
print(func('afdffsfsf'))②
def func(x):return True if len(x) > 5 else False
print(func([1,2,3,4,5,6,7]))

①：
def func(a):return a[:2] if len(a) > 2 else None
print(func([1,2,3,4]))②：def func(a):return a[:2]
print(func([1]))

def func(a):s = s1 = s2 = s3 = 0for i in a:if i.isspace():s += 1elif i.isalpha():s1 += 1elif i.isdigit():s2 += 1else:s3 += 1return ('空格：%s，字母：%s，数字：%s，其他：%s，'%(s,s1,s2,s3))
print(func('fdkls4909fjksj jfkd'))

def func(x,y):return x if x > y else y
print(func(10,5))

①
dic = {"k1": "v1v1", "k2": [11,22,33,44]}
def func(a):for i in a:a[i] = a[i][:2]return a
print(func(dic))②
dic = {"k1": "v1v1", "k2": [11,22,33,44]}
newdic = {}
def func(a):for k, v in a.keys():if len(v) > 2:s = v[0:2]newdic[k] = selse:newdic[k] = vreturn a
print(func(dic))

①
def func(a):dic = {}if type(a) == list:for k,v in enumerate(a):   #枚举法dic[k] = vreturn dic
print(func([11,22,33,44]))

def func(name,sex,age,education):with open("student_msg","a",encoding="utf-8") as f:f.write(name+'_'+sex+'_'+age+'_'+education+'\n')name = input("请输入你的姓名：")
gender = input("请输入你的性别：")
age = input("请输入你的年龄：")
education = input("请输入你的学历：")
print(func(name,gender,age,education))

def func(name,age,education,sex="男"):with open("student_msg","a",encoding="utf-8") as f:li = "\t".join([name,sex,age,education])f.write(li+"\n")flag = 1
while flag:name = input("请输入你的名字(输入q或者Q退出)：").strip()if name.strip().upper() == 'Q':flag = 0breakelse:sex = input("请输入你的性别(默认为男，回车即可)：")age = input("请输入年龄：")education = input("请输入学历")if sex =="女":func(name,age,education,sex)else:func(name,age,education)

import os
with open('change',encoding='utf-8') as f1,\open('change.bak',encoding='utf-8',mode="w") as f2:for i in f1:new_line = i.strip().replace('alex','SB')f2.write('%s\n'% new_line)
os.remove('change')
os.rename('change.bak','change')

def register():while True:username = input('请输入新帐号：').strip()password = input('请输入新密码：').strip()with open('name_list', encoding='utf-8', mode='a+') as f:f.seek(0)for i in f:i = i.split()if username in i:print('此帐号已存在，请重新注册！')breakelse:f.write('{}\t{}\n'.format(username, password))return '注册成功'
# print(register())def login():num = 1while num <= 3:username = input('请输入用户名：')password = input('请输入密码：')with open('name_list', encoding='utf-8') as f1:for i in f1:i = i.split()if username in i and password in i:return '登录成功！'else:print('帐号或密码错误，请重新输入！ 您还有%s次机会。' % (3 - num))num += 1return '登录失败！'
# print(login())print('1，登录\n2，注册')
while True:choice = input('请输入序号：').strip()if choice == '1':print(login())breakelif choice == '2':print(register())print(login())breakelse:print('输入有误，请重新输入选择！')