字符串格式化

name = "zhang"
age = 20
weight = 55.5
result = "我是%s，今年%i岁,体重：%s" % (name, age, weight)

# 推荐使用下面的方法
info = f"我是{name}，今年{age}岁,体重：{weight}"

print(result)
print(info)