《莫烦Python》笔记 -- python部分

这次只记了没见过的或者我觉得有必要记录一下的

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1.文件读取与输出

```
text = 'this is my firsttest.\nthis is next line.\nthisis the last test.'
my_file = open('my_file.txt','w') # w表示write，是写入模式,假如路径中没有此文件，则会自动创建一个
my_file.write(text)
my_file.close()
```
```
file = open('my_file.txt','r') # r表示read，是只读模式
content= file.read()
print(content)
my_file.close()
```

图1.1

```
file = open('my_file.txt','r') # r表示read，是只读模式
content= file.readlines()
print(content)
my_file.close()
```

图1.2

上述方法读取后需要以my_file.close()结尾以关闭打开的文件，不妨考虑下面的方法：

with openopen('my_file.txt','r') as file:
    content= file.read()
    print(content)

2. zip,lambda,map

a = [1,2,3]
b = [4,5,6]
list(zip(a,b))

for i,j in zip(a,b):
    print(i/2,j*2)

list(zip(a,a,b))

func = lambda x,y:x+y

list(map(func,[1,3],[2,5]))

图2

3. copy&deepcopy

import copy

a = [1,2,3]
b = a
b[1]=22
print(a)
print(id(a) == id(b))

# 浅复制
a = [1,2,[3,4]]
d = copy.copy(a)
print(id(a) == id(d))
d[0] = 111
print(a)
print(id(a[2]) == id(d[2]))
d[2][1]=444
print(a)

# 深复制
a = [1,2,[3,4]]
c = copy.deepcopy(a)
print(id(a) == id(c))
c[1] = 33
print(c)
print(a)

c[2][1] = 333
print(c)
print(a)

图3.1

图3.2

4. threading多线程

5. multiprocessing多进程

6. tkinner

7. set找不同

8. 正则表达式