while 循环

Python 中级

Hugo Bowne-Anderson

Data Scientist at DataCamp

if-elif-else

control.py

仅通过该结构一次！

z = 6
if z % 2 == 0 :  # True
    print("z is divisible by 2")  # 执行
elif z % 3 == 0 :
    print("z is divisible by 3")
else :
    print("z is neither divisible by 2 nor by 3")

...   # 继续

While 循环 = 重复的 if 语句

While

while condition :
    expression

数值计算模型
"重复执行，直到满足条件"
示例
- 误差初始为 50
- 每次运行将误差除以 4
- 继续直到误差不再 > 1

While

while condition :
    expression

while_loop.py

error = 50.0


while error > 1:

    error = error / 4

    print(error)

误差初始为 50
每次运行将误差除以 4
继续直到误差不再 > 1

While

while condition :
    expression

while_loop.py

error = 50.0
#     50
while error > 1:    # True
      error = error / 4
      print(error)

12.5

While

while condition :
    expression

while_loop.py

error = 50.0
#     12.5
while error > 1:    # True
      error = error / 4
      print(error)

12.5
3.125

While

while condition :
    expression

while_loop.py

error = 50.0
#     3.125
while error > 1:    # True
      error = error / 4
      print(error)

12.5
3.125
0.78125

While

while condition :
    expression

while_loop.py

error = 50.0
#     0.78125
while error > 1:    # False
    error = error / 4
    print(error)

12.5
3.125
0.78125

While

while condition :
    expression

while_loop.py

error = 50.0
while error > 1 :    # always True
    # error = error / 4
    print(error)

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Python 中级