python学习(十)之阶段性总结

库名的两种调用方式

import turtle
from turtle import *

  

 

  
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1.9*9乘法口诀

ps：注意缩进不能变，{:2} ':‘前无空格意思为结果保留两位有效位 end=’'也无空格 可在print{:2}后加空格，代码更加美观

for i in range(1,10):
    for j in range(1,i+1):
        print("{}*{}={:2} " .format(j,i,i*j),end='')
    print(' ')

  

 

  
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2.阶乘累加

sum, tmp = 0, 1
for i in range(1,11):
    tmp *= i
    sum += tmp
print('运算结果为：{} '.format(sum))    

  

 

  
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3.猴子吃桃

n = 1 
for i in range(5,0,-1):
    n = (n+1)<<1
print(n)

  

 

  
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4.菜谱

diet = ['西红柿', '花椰菜', '黄瓜', '牛排', '虾仁']
for x in range(0,5):
    for y in range(0,5):
        if (x!=y):
            print('{}{}' .format(diet[x],diet[y]))

  

 

  
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5.五角星绘制

color和fillcolor的区别，color可以确定两个即画笔颜色和填充颜色，fillcolor只能确定填充颜色

from turtle import *
fillcolor('red')
begin_fill()
while True:
    forward(200)
    right(144)
    if abs(pos()) < 1:
        break
end_fill()

  

 

  
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6.太阳花绘制

from turtle import *
color('red', 'yellow')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos()) < 1:
        break
end_fill()
done()

  

 

  
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7.螺旋线绘制

turtle.speed(‘fastest’)速度很快

import turtle
import time
turtle.speed('fastest')
turtle.pensize(2)
for x in range(100):
    turtle.forward(2*x)
    turtle.left(90)
time.sleep(3)

  

 

  
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8.彩色螺旋线绘制

turtle.tracer(False)直接画完，不显示过程，只显示结果

import turtle
import time
turtle.pensize(2)
turtle.bgcolor('black')
colors = ['red', 'yellow', 'purple', 'blue']
turtle.tracer(False)
for x in range(400):
    turtle.forward(2*x)
    turtle.color(colors[x % 4])
    turtle.left(91)
turtle.tracer(True)
time.sleep(3)

  

 

  
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9 float可用eval替换 ,将字符串str当成有效的表达式来求值并返回计算结果。

参考http://blog.csdn.net/u011138533/article/details/61920477

#tempConvert.py
val = input('请输入温度值(如：32C): ')
if val[-1] in ['C', 'c']:
    f = 1.8 * float(val[0:-1]) + 32
    print('转化后的温度为: %.2fF'%f)
elif val[-1] in ['F', 'f']:
    c = (float(val[0:-1] - 32))/1.8
    print('转化后的温度为: %.2fC'%c)
else:
    print('输入有误')

  

 

  
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10.蟒蛇绘制

import turtle

def drawSnake(rad, angle, len, neckrad):
    for i in range(len):
        turtle.circle(rad, angle)
        turtle.circle(-rad, angle)
    turtle.circle(rad, angle/2)
    turtle.fd(rad)
    turtle.circle(neckrad+1, 180)
    turtle.fd(rad*2/3)

def main():
    turtle.setup(3100, 800, 0, 0)
    pythonsize = 30
    turtle.pensize(pythonsize)
    turtle.pencolor('blue')
    turtle.seth(-40)
    drawSnake(40, 80, 5, pythonsize/2)
main()
    
彩色蟒蛇
import turtle

def drawSnake(rad, angle, len, neckrad):
    colors = ['red', 'yellow', 'purple', 'blue', 'green']
    for i in range(len):
        turtle.circle(rad, angle)
        turtle.circle(-rad, angle)
        turtle.pencolor(colors[i%5])
    turtle.circle(rad, angle/2)
    turtle.fd(rad)
    turtle.circle(neckrad+1, 180)
    turtle.fd(rad*2/3)
    turtle.done()

def main():
    turtle.setup(3100, 800, 0, 0)
    pythonsize = 30
    turtle.pensize(pythonsize)
    
    turtle.seth(-40)
    drawSnake(40, 80, 5, pythonsize/2)
main()

  

 

  
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# -*- coding: utf-8 -*-

def main():
    fileName = input("FileName")
    infile = open(fileName, 'r')
    sum = 0
    cnt = 0
    for line in infile:
        sum += eval(line)
        cnt += 1
    print("Average Num is : ", sum/cnt)
    main()
    
def main():
fileName = input("FileName")
infile = open(fileName, 'r')
sum = 0.0
cnt = 0
line = infile.readline()
while line != "":
    for xstr in line.split(","):
        sum += eval(xstr)
        cnt += 1
    line = infile.readline()
print("Average Num is : ", sum/cnt)
main()

num1, num2 = eval(input("Please input 2 num sepratedbu a comma"))

  

 

  
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python 的6种数据类型
数字类型、字符串类型
元组类型、列表类型
文件类型、字典类型

  

 

  
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复述表示为complex
可用type查看数据类型
len可查看字符串长度
eval 可把字符串表达式转化为表达式
str 可将数字转化为字符串    

  

 

  
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花括号叫字典dict
中括号叫列表list
小括号叫元组tuple 不可修改

  

 

  
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python采用两种字符串格式的方法
1.类似C语言，使用%
2.使用format() <模板字符串>.format(<逗号分隔的参数>)
模板字符串用一系列的槽组成，按照序号进行参数替换。槽中没有序号则按照顺序依次替换
槽的内部样式为：{<参数序号>:<格式控制标记>}

  

 

  
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结束一个死循环程序可以用 ctrl+c
strip()字符串用于移除字符串头尾制定的字符，默认是空格

  

 

  
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文章来源: recclay.blog.csdn.net，作者：ReCclay，版权归原作者所有，如需转载，请联系作者。

原文链接：recclay.blog.csdn.net/article/details/77862667