基础语法

读文件

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append_text='\nThis is appended file.'
my_file=open('my file.txt','a')
my_file.write(append_text)
my_file.close()

file=open('my file.txt','r')
content=file.readlines() //一行一行读存到列表里面
file.close()
print(content)

简易计算器

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class Calculator:
    name='Good calculator'
    price=18
    def __init__(self,name,price,hight,width,weight):
        self.name=name
        self.price=price
        self.h=hight
        self.wi=width
        self.we=weight
    def add(self,x,y):
        print(self.name)
        result=x+y
        print(result)
    def sub(self,x,y):
        result=x-y
        print(result)
    def mul(self,x,y):
        result=x*y
        print(result)
    def divide(self,x,y):
        result=x/y
        print(result)
calcul=Calculator('bad calculator',12,13,14,15)
print(calcul.name)
print(calcul.we)

输入：

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a_input=int(input('Please input a number:'))
if a_input == 1:
    print("This is a good number")
elif a_input == 2:
    print("See you next time")
else:
    print("Good luck")

列表的使用

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a_input=int(input('Please input a number:'))
if a_input == 1:
    print("This is a good number")
elif a_input == 2:
    print("See you next time")
else:
    print("Good luck")

一些操作

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a=[1,2,3,4,2,3,1,1]
a.append(0)
print(a)
a.remove(2) #把第一个2移出去
print(a)
print(a[-1])
print(a[0:3])
print(a[-3:])
print(a.index(2))
print(a.count(1))
a.sort()
print(a)
a.sort(reverse=True)
print(a)

try错误处理

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try:
    file=open('eeee.txt','r+')
except Exception as e:
    print('there is no file named as eeee')
    response = input('do you want to create a new file:')
    if response == 'y':
        file = open('eeee','w')
    else:
        pass
else:
    file.write('ssss')
file.close()

zip和map

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a=[1,2,3]
b=[4,5,6]
print(list(zip(a,b)))
for i,j in zip(a,b):
    print(i/2,j*2)
print(list(zip(a,a,b)))
fun2=lambda x,y:x+y
print(fun2(2,3))
print(list(map(fun2,[1],[2])))
print(list(map(fun2,[1,3],[2,5])))

pickle存放数据

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import pickle
a_dict = {'da':111,2:[23,1,4],'23':{1:2,'d':'sad'}}
# file=open('pickle_example.pickle','wb')
# pickle.dump(a_dict,file)
# file.close()
with open('pickle_example.pickle','rb') as file:
    file=open('pickle_example.pickle','rb')
    a_dict1=pickle.load(file)
    file.close()
    print(a_dict1)