Python entry-level small program (1) (with source code)

Python entry-level small program (1) (with source code)

(1) Calculation of circle area.

radius=25                      #设置圆的半径
area=3.1415*radius*radius      #输入计算圆面积公式
print(area)            
print("{:.2f}".format(area))   #只输出两位小数

How to enter the radius:

radius=input("输入半径：") #圆的半径使是25
area=radius*radius*3.1415#输入计算圆的面积公式
print("{:.2f}".format(area))

(2) Simple name dialogue.

name=input("输入姓名:")
print("{}同学，学好python，前途无量！"。format(name))
print("{}大侠，学号python，大展拳脚！".format(name[0]))
print("{}哥哥，学好python，人见人爱！".format(name[1:]))

(3) Fibonacci sequence calculation.

a,b=0,1
while a<1000:     #输出不大于1000的数列
...          print(a,end=',')
...          a,b=b,a+b
...

(4) The drawing of cotangent circles.

import turtle              #引用turtle库
turtle.pensize(2)          #设置画笔像素为2像素
turtle.circle(10)          #绘制半径为10像素的圆
turtle.circle(40)          #绘制半径为40像素的圆
turtle.circle(80)          #绘制半径为80像素的圆
turtle.circle(160)         #绘制半径为160像素的圆

Continuously updating. .