Python 基础学习1

最新开始自学Python，下面是做的习题，自我记录一下，方便日后查看。

# 有4个数字，1，2，3，4 他们可以组成多少个互不相同且无重复数字的3位数，各是多少
def test1():
        i=1
        j=1
        k=1
        n=0
        while i<5:
                print('i')
                while j<5:
                        print('j')
                        while k<5:
                                if i!=j and j!=k and i!=k :
                                        print('k',i*100+j*10+k)
                        k=k+1
                j=j+1
        i=i+1

 

#一个整数加上100后是一个完全平方数，在加上168有是一个完全平方数，，轻微该数是多少
def test2():
        li = [x*x for x in range(50)]
        while True:
                i=n+100
                j=n+100+168
                if i in li and j in li:
                         print('n=',n)
                         break
                else:
                        n = n+1
       

#输入某年某月某日，判断这一天是这一年的第几天
#print("Please input datetime,as YYYY-MM-DD")
#d = input()                       
import re
def countDays(datetime):
        if re.match(r'd{4}-d{2}-d{2}',datetime):
                year = datetime[:4]
                month = datetime[5:7]
                day=datetime[-2:]
                days = int(day)
                feb = 28
                if month == '01':
                        print("这一天是",year,"的第",days,"天")
                elif month == '02':
                        if int(year) %100 ==0 and int(year) %400 ==0:
                                feb=29
                        elif int(year) %100 !=0 and int(year) %4 ==0:
                                feb = 29                       
                        print("这一天是",year,"的第",31+days,"天")
                elif month == '03':
                        print("这一天是",year,"的第",31+feb+days,"天")
                elif month == '04':
                         print("这一天是",year,"的第",31*2+feb+days,"天")
                elif month == '05':
                         print("这一天是",year,"的第",31*2+30+feb+days,"天")
                elif month == '06':
                         print("这一天是",year,"的第",31*3+30+feb+days,"天")
                elif month == '07':
                         print("这一天是",year,"的第",31*3+30*2+feb+days,"天")
                elif month == '08':
                         print("这一天是",year,"的第",31*4+30*2+feb+days,"天")
                elif month == '09':
                         print("这一天是",year,"的第",31*4+30*3+feb+days,"天")
                elif month == '10':
                         print("这一天是",year,"的第",31*5+30*3+feb+days,"天")
                elif month == '11':
                         print("这一天是",year,"的第",31*6+30*3+feb+days,"天")
                elif month == '12':
                         print("这一天是",year,"的第",31*6+30*4+feb+days,"天")
                else:
                        print("inut error")
        else:
                print("input error")

#输入3个整数x,y,z， 请把这3个数由小到大输出
import types
def order_min_to_max(li):
        i,j=0,1
        n = 0
        while i <len(li):
                while j<len(li):
                        print("li=:",li)
                        pass
        print("li order by min to max:",li)

def test3(li):
        li.sort()
        print("sorted order:",li)

def test4():
        print("sort order:",sorted(li))
        bn

#输出9*9乘法口诀

def multi():
        for i in range(1,10):
                for j in range(1,10):
                        if i>=j:
                                print(i,'*',j,'=',i*j,end='   ')
                print()

#判断101到200之间有多少个素数，并输出所有素数
def isPrimeNumber(n1,n2):
        for i in range(n1,n2):
                k,f=2,0
                while k<i:
                        if i%k ==0:
                                f=1
                                break
                        else:
                                k+=1
                if f==0:
                        print(i,end='  ')

#输出所有“水仙花数”，水仙花 数是指一个3位数，并其各位数立方之和等于该数本省，例如 153 = 1**3+5**3+3**3
def isNarcissistic_number():
        for i in range(100,999):
                j = int(str(i)[0])
                k = int(str(i)[1])
                n = int(str(i)[2])
                if i== j**3 + k**3 + n**3:
                        print(i,end='  ')

#对一个正整数分解质因数 例如 90=2*3*5*3; 234=[2, 3, 13]
def Comp_prime_factor(k):
        n,f =2,0
        for i in range(2,k):
                if k%i ==0 :
                        #print('k',k,'%i',i,'=',k%i)
                        while 2<=n<i:
                                #print('i',i,'%n',n,'=',i%n)
                                if i%n ==0:
                                        f=1
                                n+=1
                        if f==0:
                                print('i=',i)
                n = 2
                f = 0
#利用条件运算符的嵌套来完成，高于90为A，60 到 89之间 用B 表示， 60 分一下用C表示
def test_student_grade(score):
        try:
                if re.match(r'd{2}',score):
                        if score>90:
                                print("Grade is A")
                        elif 60<score<89:
                                print("Grade is B")
                        elif score<60:
                                print("Grade is C")
                else:
                        print("arg error")
        except:
                print("arg error")

'''#输出指定格式的日期，提示用detetime'''

#输入一行字符串，分别统计出其中的英文字母，空格，数字和其他字符的个数
def count_str_num(str):
        num,abc,non,other=0,0,0,0
        for s in str:
                if s.isdigit():
                        num+=1
                elif s.isalpha():
                        abc+=1
                elif s==' ':
                        non+=1
                else:
                        other+=1
        print("alpha_count=",abc,"none_count=",non,"number_count=",num,'others_count=',other)
       
# 求s  = a+aa+aaa+aaaa+aaaaad 值(a是一个数，相加字数的个数将由用户通过键盘输入来指定)
def sum_num(number,count_num):
        s,temp=0,number
        li=[number]
        for i in range(0,count_num):               
                s = s + temp
                print("temp = ",temp,'s=',s)
                temp= temp*10 + number
                li.append(temp)
        print("s = ",str(li),'= ',s)
       

#一个数如果切好等于他的因子之和，这个数就称为 “完数”。例如6=1+2+3，编程找出1000以内的所有完数
def is_perfect_number(n):
        for i in range(1,n):
                j = 1
                li=[] # 将i中的因子放在li list 中
                while j<i:
                        if i%j ==0:
                                li.append(j)
                        j+=1
                j = 1
                s = 0
                for k in li:
                        s = s+k
                if s == i:
                        print(i, end=' ')

#将一个列表的数据复制到另一个列表中
li=[1,2,3]
li2 =li.copy()
#一个球从100米高度自由落下，每次落地后反弹回原高度的一半，在落下，呢么他在第10此了哟第时，
#共经过多少米？第10次反弹多高

#

#

#输出如下图案,arg=9
'''
      *
    ***
  *****
*******
  *****
    ***
      *
'''
def rhombus(n):
        li=[]
        if n%2!=0:
                n = n-1
        for i in range(0,n):
                if i%2!=0:
                        k = 0
                        while k< n-int(i):
                               print(' ',end='')
                               k+=1
                        k=0
                        while k< int(i):
                                print('*',end='')
                                k+=1
                        print()
                        li.append(i)
        list.sort(li,reverse=True)
       # print(li)
        for j in li[1:]:
                m =0
               # print(max(li), int(j))
                while m<=max(li)-int(j):
                        print(' ',end='')
                        m+=1
                m=0
                while m<int(j):
                        print('*',end='')
                        m+=1
                print()
      

#有1分数序列：2/1， 3/2， 5/3 ， 8/5， 13/8， 21/13，求这个数列前20项之和
def sum(n):
    i,j,k,s = 1,1,0,0
    maxnum = n/2 + 1
    for m in range(1,int(maxnum)):
        if int(m)==1:
            k =i+j
            s = k/i
            print(k,'/',i,end =' ')
        else:
            k = k+i
            s = s+k/i
            print(k,'/',i,end =' ')
        i = i+k
        print(k,'/',i,end =' ')
        s =s+i/k
    print('s=',s)

def sum2(n):
    i,j,s = 1,2,0
    for m in range(0,n):
        s = s + j/i
        j = i+j
        i = j-i      
    print('s=',s)