●2-1 基本的温度转换程序

#e1.1TempConvert.py
TempStr = input("请输入带有符号的温度值: ")
if TempStr[-1] in ['F','f']:
    C = (eval(TempStr[0:-1]) - 32)/1.8
    print("转换后的温度是{:.2f}C".format(C))
elif TempStr[-1] in ['C','c']:
    F = 1.8*eval(TempStr[0:-1]) + 32
    print("转换后的温度是{:.2f}F".format(F))
else:
    print("输入格式错误")

该示范实例暂不支持互动输入内容，不能完美运行，请用idle调试。

●2-2 循环执行的温度转换程序

#e1.2TempConvert.py
TempStr = input("请输入带有符号的温度值: ")
while TempStr[-1] not in ['N','n']:
    if TempStr[-1] in ['F','f']:
        C = (eval(TempStr[0:-1]) - 32)/1.8
        print("转换后的温度是{:.2f}C".format(C))
    elif TempStr[-1] in ['C','c']:
        F = 1.8*eval(TempStr[0:-1]) + 32
        print("转换后的温度是{:.2f}F".format(F))
    else:
        print("输入格式错误")
    TempStr = input("请输入带有符号的温度值: ")

该示范实例暂不支持互动输入内容，不能完美运行，请用idle调试。

●2-3 函数封装的温度转换程序

#e1.3TempConvert.py
def tempConvert(ValueStr):
    if ValueStr[-1] in ['F','f']:
        C = (eval(ValueStr[0:-1]) - 32)/1.8
        print("转换后的温度是{:.2f}C".format(C))
    elif ValueStr[-1] in ['C','c']:
        F = 1.8*eval(ValueStr[0:-1]) + 32
        print("转换后的温度是{:.2f}F".format(F))
    else:
        print("输入格式错误")
TempStr = input("请输入带有符号的温度值: ")
tempConvert(TempStr)

该示范实例暂不支持互动输入内容，不能完美运行，请用idle调试。

●2-4 Python蟒蛇绘制程序

# turtle
#e2.1DrawPython.py
import turtle
turtle.setup(650, 350, 200, 200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(25)
turtle.pencolor("purple")
turtle.seth(-40)
for i in range(4):
    turtle.circle(40, 80)
    turtle.circle(-40, 80)
turtle.circle(40, 80/2)
turtle.fd(40)
turtle.circle(16, 180)
turtle.fd(40 * 2/3)

●2-5 Python蟒蛇绘制程序

# turtle
#e2.2DrawPython.py
from turtle import *
setup(650, 350, 200, 200)
penup()
fd(-250)
pendown()
pensize(25)
pencolor("purple")
seth(-40)
for i in range(4):
    circle(40, 80)
    circle(-40, 80)
circle(40, 80/2)
fd(40)
circle(16, 180)
fd(40 * 2/3)

●2-6 函数封装的Python蟒蛇绘制程序

# turtle
#e2.3DrawPython.py
import turtle
def drawSnake(radius, angle, length):
    turtle.seth(-40)
    for i in range(length):
        turtle.circle(radius, angle)
        turtle.circle(-radius, angle)
    turtle.circle(radius, angle/2)
    turtle.fd(40)
    turtle.circle(16, 180)
    turtle.fd(40* 2/3)
turtle.setup(650, 350, 200, 200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(25)
turtle.pencolor("purple")
drawSnake(40, 80, 4)
turtle.done()