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 = 222
print(abc+_bc)

#python变量
a=5
a=a+1
a+=1
print(a)

#python数据类型
'''数、字符串、列表list、元组tuple、集合set、字典dictionary'''
a=10
b="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=9
b=2
print(a/b)
print(a//b)
print(a%b)

#python缩进
a=10
b=9
if(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=91
if(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=5
while(i<10):
    print(i)
    i+=1

a=["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break
for 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()