zhaowei - 学习变量名

import turtle
turtle.color("yellow green")
turtle.pensize(3)
# 速度 speed
turtle.speed(1)
# shape 形状
turtle.shape('turtle')

# 拿一个盒子，把这个数据给他装起来，每次要用的话看一下盒子里的数据是多少
# 变量：装数据的盒子
# 变量名（取名）：张3  李%  王*** 王8
# 一、取名规则：
# 1.变量名是由英文字母、数字、下划线 __ 任意组成的
# 2.不能有标点符号，数字不能作为开头
# abc  laoba cxk123 _______123  _   a.c  12abc  蔡徐坤
# 法无禁止即自由，不建议使用中文，效率比较低
# 二、取名技巧： 见名知意，英文单词 > 拼音 > 中文 > 日文德文
# 下划线命名法： jiao_du
long = 500
# 角度  angle jiaodu
angle = 179

turtle.fd(long)
turtle.rt(angle)
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turtle.done()

import turtle
turtle.color("yellow green")
# fill 填充
turtle.fillcolor("red")
turtle.pensize(3)
# 速度 speed
turtle.speed(1)
# shape 形状
turtle.shape('turtle')
long = 100
# 角度  angle jiaodu
angle = 90
# 开始填充 begin_fill
turtle.begin_fill()
turtle.fd(long)
turtle.rt(angle)
turtle.fd(long)
turtle.rt(angle)
turtle.fd(long)
turtle.rt(angle)
turtle.fd(long)
turtle.rt(angle)
# 结束填充 end_fill
turtle.end_fill()
turtle.done()

import math
# 电脑  computer 计算机
# 乘号*   加上+   乘方 **  减 - 除/
a = 2**1000
# print 打印
print(a)
b = math.sqrt(2)
print(b)