目录
4.while for control+[/] 左/右缩进 （缩进是四个空格）
1.jupyter简单操作
首先是编译器的简单操作，这里我选择的是jupyter notebook。下面是常用到的三个简单快捷键：
选中代码块使其变为蓝色，之后输入快捷键。
dd delet
shift+enter光标移动/ctrl+enter run
m markdown
下面是python的基础语法！
2.print()用法
print(1)print('yi')print("i'm")print('i\'m')print('a'+'b')输出：1yii'mi'mab3.math 举一个平方的例子
2**38
4.while for control+[/] 左/右缩进 （缩进是四个空格）
i=0while(i<3): print(i) i=i+1for i in range(1,5): print(i)输出：0 1 2 1 2 3 4
5.if if_else if_elif_else
if a>b: print()if a>b: print()else: print()if a>b: print()elif a=b: print()elif ...:...else: print()6.function 函数定义格式
def function(a,b): x=a+b print(x)function(3,4)输出：7
函数默认参数的定义
def default_fun(a,b=3): x=a+b print(x)default_fun(2)输出：5
默认参数右边不能有需赋值的参数
def default_fun(a=3,b): x=a+b print(x)default_fun(2)报错 SyntaxError: non-default argument follows default argument7.创建文件并写入
text="1,2,3"file=open('text.txt','w')file.write(text)file.close()8.向已有文件中写入
append="\nhello world"file=open('text.txt','a')file.write(append)file.close()9.读文件
file=open('text.txt','r')a=file.read()print(a)输出：
1,2,3hello world10.class 类的创建
class calculator: price=18 brand="casco" def add(self,x,y): result=x+y print(result) def show(self):#self print(self.price)calculator1=calculator()calculator1.add(3,5)calculator1.show()输出
818记住self和this指针类似不要忘记写
class calculator: def __init__(self,name,price,brand,size):##init function self.n=name self.p=price self.b=brand self.s=size def show(self): print(self.n,self.p,self.b,self.s)calculator2=calculator('q',3,'y',2)calculator2.show()calculator2.nclass calculator: def __init__(self,name='e',price=8,brand='u',size=7):##init function default self.n=name self.p=price self.b=brand self.s=size def show(self): print(self.n,self.p,self.b,self.s)calculator2=calculator()calculator2.show()输出：e 8 u 7
11.input函数
a=input()if a=='1':##input 默认字符串输入可强制类型转换 print('yes')else: print('no')输出
1yes12.元组与列表
a_tuple=(1,2,3,4,5,6)a_list=[7,6,5,4,3,2]for i in a_tuple: print(i) # ifor i in range(len(a_list)): print(a_list[i]) #[ ]a_list=[7,6,5,4,3,2] a_list.append('a')print(a_list)a_list.insert(3,'h')print(a_list)a_list.remove('h')print(a_list)print(a_list[-1])print(a_list[2:4]) #2-3print(a_list.index('a')) # indexb_list=[1,8,5,8,9,2]b_list.sort()print(b_list) #small->bigb_list.sort(reverse=True) print(b_list) #big->small输出：
[7, 6, 5, 4, 3, 2, 'a'][7, 6, 5, 'h', 4, 3, 2, 'a'][7, 6, 5, 4, 3, 2, 'a']a[5, 4]6[1, 2, 5, 8, 8, 9][9, 8, 8, 5, 2, 1]多维列表
a_multi_list=[ [1,2,3], [4,5,6], [7,8,9]]print(a_multi_list[0][0]) #[a][b]13.dictionary 字典
diction={'key1':'value1','key2':'value2','key3':'value3'}print(diction['key2'])del diction['key2']print(diction)#字典中value可以是元组 列表 函数 字典。。输出：
value2{'key1': 'value1', 'key3': 'value3'}14.import 导入模块
import time as tprint(t.localtime())输出：
time.struct_time(tm_year=2022, tm_mon=6, tm_mday=26, tm_hour=19, tm_min=57, tm_sec=2, tm_wday=6, tm_yday=177, tm_isdst=0)15.break&continue 语句
while True: b=input() if b=='1': print('end') break else: print('go on')while True: b=input() if b=='1': print('end') continue else: print('go on')16.zip map lambda 函数
zip：
a=[1,2,3]b=[4,5,6]zip(a,b)list(zip(a,b))[(1, 4), (2, 5), (3, 6)]a=[1,2,3] b=[4,5,6] # 1 2 3zip(a,b,b) # 4 5 6list(zip(a,b,b)) # 4 5 6[(1, 4, 4), (2, 5, 5), (3, 6, 6)]lambda 的作用和函数类似
def plus(x,y): return(x+y)plus(2,6)7
plus2=lambda x,y:x+yplus2(4,3)7
map：
def plus(x,y): return(x+y)map(plus,[1],[2])list(map(plus,[1],[2]))[3]
来源地址：https://blog.csdn.net/yihouwen/article/details/125491516
