Reference documents

Python Programming
windows python library

Identifiers and variables

Input and output

example —— Find triangle area ：

import math
a = int(input())
b = int(input())
c = int(input())
p = (a + b + c) / 2
# '*' It means multiply ,math.sqrt It means open root
area = math.sqrt(p * (p - a) * (p - b) * (p - c))
print(" The side length of the triangle ：", a, b, c, end=' ')
print(" The area of the triangle :", area)

example —— utilize turtle Draw Pentagram

# turtle Draw Pentagram 
import turtle
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.done()

Possible solutions ：pycharm Yes turtle There are conflicts
find turtle.py,
You can be right turtle The source code of the library is modified as follows ：
Comment out the original _ all_, Add the following ：

# __all__ = (_tg_classes + _tg_screen_functions + _tg_turtle_functions +
# _tg_utilities + ['Terminator']) # + _math_functions)
__all__ = ['ScrolledCanvas', 'TurtleScreen', 'Screen', 'RawTurtle', 'Turtle', 'RawPen', 'Pen', 'Shape', 'Vec2D', 'back',
'backward', 'begin_fill', 'begin_poly', 'bk', 'addshape', 'bgcolor', 'bgpic', 'bye', 'clearscreen',
'colormode', 'delay', 'exitonclick', 'getcanvas', 'getshapes', 'listen', 'mainloop', 'mode', 'numinput',
'onkey', 'onkeypress', 'onkeyrelease', 'onscreenclick', 'ontimer', 'register_shape', 'resetscreen',
'screensize', 'setup', 'Terminator', 'setworldcoordinates', 'textinput', 'title', 'tracer', 'turtles',
'update', 'window_height', 'window_width', 'write_docstringdict', 'done', 'circle', 'clear', 'clearstamp',
'clearstamps', 'clone', 'color', 'degrees', 'distance', 'dot', 'down', 'end_fill', 'end_poly', 'fd',
'fillcolor', 'filling', 'forward', 'get_poly', 'getpen', 'getscreen', 'get_shapepoly', 'getturtle', 'goto',
'heading', 'hideturtle', 'home', 'ht', 'isdown', 'isvisible', 'left', 'lt', 'onclick', 'ondrag', 'onrelease',
'pd', 'pen', 'pencolor', 'pendown', 'pensize', 'penup', 'pos', 'position', 'pu', 'radians', 'right', 'reset',
'resizemode', 'rt', 'seth', 'setheading', 'setpos', 'setposition', 'settiltangle', 'setundobuffer', 'setx',
'sety', 'shape', 'shapesize', 'shapetransform', 'shearfactor', 'showturtle', 'speed', 'st', 'stamp', 'tilt',
'tiltangle', 'towards', 'turtlesize', 'undo', 'undobufferentries', 'up', 'width', 'write', 'xcor', 'ycor']

Built in conversion function

function

# Input n（n >= 10）, seek 1+2+...+n The sum of the .
n=int(input())
s=sum(list(range(n+1)))
print(s)

# Produce the same number for each N digit 
a,b=input().split(',')
print(int(str(int(a))*int(b)))

Format output

To be continued

aggregate

aggregate (set) It's a kind of container , Element has no order , And the value of the element is not repeated . The literal value of the set is in curly brackets {}.

Dictionaries