#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')
