python--第六天练习题

#1.正则表达式计算 origin = "1 - 2 * ( ( 60 - 30 + ( -40.0 / 5 ) * ( 9 - 2 * 5 / 3 + 7 / 3 * 99 / 4 * 2998 + 10 * 568 / 14 )) - ( - 4 * 3 ) / ( 16 - 3 * 2))"

import re

import functools

def checkInput(formula):

    """检测输入合法与否,是否包含字母等非法字符"""

    return not re.search("[^0-9+\-*/.()\s]",formula)

def formatInput(formula):

    """标准化输入表达式，去除多余空格等"""

    formula = formula.replace(' ','')

    formula = formula.replace('++', '+')

    formula = formula.replace('+-', '-')

    formula = formula.replace('-+', '-')

    formula = formula.replace('--', '+')

    return formula

def mul_divOperation(s):

    """乘法除法运算"""

    # 1-2*-14969036.7968254

    s = formatInput(s)

    sub_str = re.search('(\d+\.?\d*[*/]-?\d+\.?\d*)', s)

    while sub_str:

        sub_str = sub_str.group()

        if sub_str.count('*'):

            l_num, r_num = sub_str.split('*')

            s = s.replace(sub_str, str(float(l_num)*float(r_num)))

        else:

            l_num, r_num = sub_str.split('/')

            s = s.replace(sub_str, str(float(l_num) / float(r_num)))

        #print(s)

        s = formatInput(s)

        sub_str = re.search('(\d+\.?\d*[*/]\d+\.?\d*)', s)

    return s

def add_minusOperation(s):

    """加法减法运算

    思路：在最前面加上+号，然后正则匹配累加

    """

    s = formatInput(s)

    s = '+' + s

    #print(s)

    tmp = re.findall('[+\-]\d+\.?\d*', s)

    s = str(functools.reduce(lambda x, y:float(x)+float(y), tmp))

    #print(tmp)

    return s

def compute(formula):

    """无括号表达式解析"""

    #ret = formula[1:-1]

    ret = formatInput(formula)

    ret = mul_divOperation(ret)

    ret = add_minusOperation(ret)

    return ret

def calc(formula):

    """计算程序入口"""

    has_parenthesise = formula.count('(')

    if checkInput(formula):

        formula = formatInput(formula)

        while has_parenthesise:

            sub_parenthesise = re.search('\([^()]*\)', formula) #匹配最内层括号

            if sub_parenthesise:

                #print(formula+"...before")

                formula = formula.replace(sub_parenthesise.group(), compute(sub_parenthesise.group()[1:-1]))

                #print(formula+'...after')

            else:

                #print('没有括号了...')

                has_parenthesise = False

        ret = compute(formula)

        print('结果为：')

        return  ret

    else:

        print("输入有误！")

-------------------------------------------------------------------------------------------

def add(args):  #加减

    args = args.replace(' ', '')

    args = args.replace('++', '+')

    args = args.replace('+-', '-')

    args = args.replace('-+', '-')

    args = args.replace('--', '+')

    tmp = re.findall("([+\-]?\d+\.?\d*)", args)

    ret = 0

    for i in tmp:

        ret = ret + float(i)

    return ret

def mul(args):

    #乘除

    while True:

        ret = re.split("(\d+\.?\d*[\*/][\+-]?\d+\.?\d*)",args,1)

        if len(ret) == 3:

            a = ret[0]

            b = ret[1]

            c = ret[2]

            if "*" in b:

                num1,num2 = b.split("*")

                new_b = float(num1) * float(num2)

                args = a + str(new_b) + c

            elif "/" in b:

                num1, num2 = b.split("/")

                new_b = float(num1) / float(num2)

                args = a + str(new_b) + c

        else:

            return add(args)

def calc(args):

    while True:

        args = args.replace(" ", "")

        ret = re.split("\(([^()]+)\)",args,1)

        if len(ret) == 3:

            a,b,c = ret

            r = mul(b)      #调用乘除得到计算结果

            args = a + str(r) + c

        else:

            return mul(args)

print(calc(origin))

print(eval(origin))

#2.将“我我我、、、我我、、我要、我要要、、、要要要、、要要、、学学学、、、、学学编、、、学编编编、、编编编程、、程程”还原成：我要学编程

f = "我我我、、、我我、、我要、我要要、、、要要要、、要要、、学学学、、、、学学编、、、学编编编、、编编编程、、程程"

c = ''

import re

a = re.sub(r'、','',f)

for i in a:

    if i not in c:

        c += i

print(c)

#3.查找IP地址

temp = "192.168.1.200 10.10.10.10 3.3.50.3 127.0.0.1 244.255.255.249 273.167.189.222"

# sel = re.compile(r'((25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))')

# 参考：https://www.cnblogs.com/brogong/p/7929298.html

f = re.compile(r"\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b")

ip = f.findall(temp)

print(ip)

#4.读写用户的输入，根据用户输入，创建一个相应的目录

improt os,sys

os.mkdir(sys.argv[1])

#5.进度条，显示百分比

import sys,time,datetime

#

for i in range(1,101):

    if i == 100:

        b = '完成'

    else:

        b = '进度中'

    for a in ['\\','|','/','=']:

        sys.stdout.write("\r")

        sys.stdout.write(r'%s%s%s %s%% ' % (b,int(i/100*100)*'=',a,int(i/100*100)))

        sys.stdout.flush()

        time.sleep(0.3)

#6.密码加密版，用户登录

import hashlib

def md5(pawd):

    hash = hashlib.md5(bytes('fana,*=',encoding='utf-8'))

    hash.update(bytes(pawd,encoding='utf-8'))

    return hash.hexdigest()

def zhuce(user,pawd):

    with open('fana.db','a',encoding='UTF-8') as f:

        tmp = user + '|' + md5(pawd) + '\n'

        f.write(tmp)

def denglu(user,pawd):

    with open('fan.db','r',encoding='UTF-8') as f:

        for line in f:

            u,p = line.strip().split('|')

            if u == user and p == md5(pawd):

                return True

        return False

i = input('登陆按1，注册按2：')

if i == '2':

    user = input('用户名：')

    pawd = input('密码：')

    zhuce(user,pawd)

    print('注册成功')

if i == '1':

    user = input('用户名：')

    pawd = input('密码：')

    re = denglu(user,pawd)

    if re:

        print('登陆成功')

    else:

        print('登陆失败')
巴特西

python--第六天练习题

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