1. print function
The print() method is used to print output, the most common function, the following is the common use of print
1. Output numbers
ptint(3+1)
2. Output string
print('hello world')
3. Expression of output operator
print(3+1)
4. Output data to a file
For example: automatically create a new test file and write text to the file
rw=open('D:/test.txt','a+') #a+表示文件不存在则创建，存在则在文件内追加文件内容
print('hello world',file=rw) #file=rw，指定文件
rw.close() #关闭文件
How to wrap the output, just add between characters
print('hello','world','python')
Two, escape character
Escape character, that is, \ + the first letter of the special function
1.\n: newline
print('hello\nworld')
Newline, ie n=newline
2.\t: tab character
print('hello\tworld') #\t代表4个制表符号，是4个空格，但现在有3个空格，拆开hell,oXXX,world
print('helloooo\tworld') #中间是4个空格，拆开hell,oooo,xxxx,world
3. \r: overwrite
print('hello\rworld')
Replace means to overwrite the previous things, and it is also understandable to select all hello and press a delete button
4.\b: delete
print('hello\bworld')
Equivalent to the bakspace button on the keyboard, delete the previous o
5. \: two backslashes represent a \
print('heep:\\\\www.baidu.com')
\ means a \, so add two \
6. The original character: make the escape character unaffected, write in front, use r or R
print(R'hello\nworld')
Note: There cannot be one \ at the end, but there can be two \
#print(r'hello\world\')
print(r'hello\world\\')
