PI = 3.1415926
t = 56.789
print("PI=",PI)
print("%.3f - %.2f" %(PI,t))

name = '张三'
age = 22
m = 2.34
#格式化"张三今年22岁,今天有零钱2.34元"
print("%s今年%d岁,今天有零钱%.2f元" % (name,age,m))
print("{}今年{}岁,今天有零钱{}元".format(name,age,m))
print("{0}今年{1}岁,今天有零钱{2}元".format(name,age,m))

print(f"{name}今年{age}岁,今天有零钱{m}元")