Adding variables to python characters

Sometimes, we need to add corresponding variables to the string. The following provides several methods for adding variables to the string:

1. + hyphen

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1. name =  'zhangsan'  
2. print('my name is '+name)  
3.   
4. #The result is my name is zhangsan  

2. % character

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1. name =  'zhangsan'  
2. age = 25  
3. price = 4500.225  
4. print('my name is %s'%(name))  
5. print('i am %d'%(age)+' years old')  
6. print('my price is %f'%(price))  
7. #Keep the specified number of decimal places (rounded up)  
8. print('my price is %.2f'%(price))  
9.   
10. The result is  
11. my name is zhangsan  
12. i am 25 years old  
13. my price is 4500.225000  
14. my price is 4500.23  

3. format() function

For the case of many variables, it is relatively troublesome to add '+' or '%'. In this case, the format function can be used

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1. name =  'zhangsan'  
2. age = 25  
3. price = 4500.225  
4. info = 'my name is {my_name},i am {my_age} years old,my price is {my_price}'\  
5.     .format(my_name=name,my_age=age,my_price=price)  
6. print(info)  
7.   
8. The result is:  
9. my name is zhangsan,i am 25 years old,my price is 4500.225