学习python第二天

海龟绘图：

import turtle # 海龟绘图
turtle.showturtle()  # showturtle展示箭头
turtle.write('搞起') # write写入字符串
turtle.forward(300)  # forword向前移动
turtle.color('red')  # coclor改变颜色，初始颜色为黑色。
turtle.left(90)      # left向左移动箭头角度，rignt向右移动箭头角度。
turtle.forward(300)  
turtle.goto(0,50)    # goto移动到某个点
turtle.goto(0,0)
turtle.penup()       # penup抬起
turtle.goto(0,300)
turtle.pendown()     # pendown放下
turtle.goto(50,50)
turtle.circle(100)   # circle画圆

 奥运五环：

import turtle

turtle.width(10)   # width加粗

turtle.color('blue')
turtle.circle(50)

turtle.penup()
turtle.goto(120,0)
turtle.pendown()
turtle.color('black')
turtle.circle(50)

turtle.penup()
turtle.goto(240,0)
turtle.pendown()
turtle.color('red')
turtle.circle(50)

turtle.penup()
turtle.goto(60,-50)
turtle.pendown()
turtle.color('yellow')
turtle.circle(50)

turtle.penup()
turtle.goto(180,-50)
turtle.pendown()
turtle.color('green')
turtle.circle(50)

 turtle---海龟绘图

https://docs.python.org/zh-cn/3/library/turtle.html#module-turtle

对象：每个对象由标识(id),类型(type),值(value)组成。变量位于：栈内存    对象位于：堆内存。

a=3   #把3赋值给a
a
3
id(3)  #3的id
140712710166240
id(a)  #a的id
140712710166240
type(3)   #3的类型
<class 'int'>
type(a)   #a的类型
<class 'int'>
print(a)
3　

标识符区分大小写，第一个字符必须为字母，单下划线，可以通过输入help()查看关键字，避免使用关键字。

max=2
Max=4
_max=6
max
2
Max
4
_max
6
help()

Welcome to Python 3.8's help utility!

If this is your first time using Python, you should definitely check out
the tutorial on the Internet at https://docs.python.org/3.8/tutorial/.

Enter the name of any module, keyword, or topic to get help on writing
Python programs and using Python modules.  To quit this help utility and
return to the interpreter, just type "quit".

To get a list of available modules, keywords, symbols, or topics, type
"modules", "keywords", "symbols", or "topics".  Each module also comes
with a one-line summary of what it does; to list the modules whose name
or summary contain a given string such as "spam", type "modules spam".

help> keywords

Here is a list of the Python keywords.  Enter any keyword to get more help.

False               class               from                or
None                continue            global              pass
True                def                 if                  raise
and                 del                 import              return
as                  elif                in                  try
assert              else                is                  while
async               except              lambda              with
await               finally             nonlocal            yield
break               for                 not   

divmod(a,b)是可以把一个除法的商和余给打印出来。

divmod(16,3)
(5, 1)

googol=10*100。

round(value)四舍五入。

round(4.3)
4