Example explanation of adding variables to strings in Python

name = 'zhangsan' 
print('my name is '+name) 
 
#结果为 my name is zhangsan

name = 'zhangsan' 
age = 25 
price = 4500.225 
print('my name is %s'%(name)) 
print('i am %d'%(age)+' years old') 
print('my price is %f'%(price)) 
#保留指定位数小数(四舍五入) 
print('my price is %.2f'%(price))

my name is zhangsan 
i am 25 years old 
my price is 4500.225000 
my price is 4500.23

name = 'zhangsan' 
age = 25 
price = 4500.225 
info = 'my name is {my_name},i am {my_age} years old,my price is {my_price}'\ 
 .format(my_name=name,my_age=age,my_price=price) 
print(info)

my name is zhangsan,i am 25 years old,my price is 4500.225