1.python基础阶段

#python输出print("xubin")#python注释法print("hello word")'''print("徐彬")print("xubin")'''#print("xubin")#python标识符abc = 1111_bc = 222print(abc+_bc)#python变量a=5a=a+1a+=1print(a)#python数据类型'''数、字符串、列表list、元组tuple、集合set、字典dictionary'''a=10b="i am a boy"c=["my","you"]d=("my","you")print(c)print(c[1])print(d)print(d[0])           #元组不支持修改a="faretesdfbfhs"           #集合中元素不能重复b="safnkrlewjroiuoitn"c=set(a)d=set(b)print(c&d)print(d|c)#字典#{key1:value1,key2:value2}a={"name":"xubin","sex":"man","age":25}print(a['sex'])#python运算符a='xubin'b='is'c='a man'print(a+" "+b+c)a=9b=2print(a/b)print(a//b)print(a%b)#python缩进a=10b=9if(a>9):    print(a)    if(b==9):        print(b)elif(a<10):    print(abc)#python控制流#程序执行流程叫程序的控制流：顺序结构，条件分支结构，循环结构，（中断结构break continue）score=91if(90>score>=60):     #if score<60    print("成绩为及格")elif(score>=90):    print("成绩为优秀")else:    print("成绩不及格")i=5while(i<10):    print(i)    i+=1a=["a","b","c","d"]for s in a:    print(s)for i in range(0,10):    print(i)#终止循环一次continue，终止循环breakfor j in range(0,8):    if(j==5):        continue    print(j)for j in range(0,8):    if(j==5):        break    print(j)#python输出乘法口诀for i in range(1,10):    for j in range(1,i+1):        print(str(i)+"*"+str(j)+"="+str(i*j)+"  ",end="")    print()for i in range(9,0,-1):    for j in range(i,0,-1):        print(str(i)+"*"+str(j)+"="+str(i*j)+"  ",end="")    print()