Python开发技巧之海象运算符的三种运用方式

import "fmt"

func main() {
    if age := 20;age > 18 {
        fmt.Println("已经成年了")
    }
}

age = 20
if age > 18:
    print("已经成年了")

age = 20
if age > 18:
    print("已经成年了")

file = open("demo.txt", "r")
while True:
    line = file.readline()
    if not line:
        break
    print(line.strip())

file = open("demo.txt", "r")
while (line := file.readline()):
    print(line.strip())

while True:
   p = input("Enter the passWord: ")
   if p == "youpassword":
      break

while (p := input("Enter the password: ")) != "youpassword":
   continue

members = [
    {"name": "小五", "age": 23, "height": 1.75, "weight": 72},
    {"name": "小李", "age": 17, "height": 1.72, "weight": 63},
    {"name": "小陈", "age": 20, "height": 1.78, "weight": 82},
]
count = 0
def get_bmi(info):
    global count
    count += 1
    print(f"执行了 {count} 次")
    height = info["height"]
    weight = info["weight"]
    return weight / (height**2)

# 查出所有会员中过于肥胖的人的 bmi 指数
fat_bmis = [get_bmi(m) for m in members if get_bmi(m) > 24]

print(fat_bmis)

fat_bmis = []

# 查出所有会员中过于肥胖的人的 bmi 指数
for m in members:
    bmi = get_bmi(m)
    if bmi > 24:
        fat_bmis.append(bmi)

# 查出所有会员中过于肥胖的人的 bmi 指数
fat_bmis = [bmi for m in members if (bmi := get_bmi(m)) > 24]