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我的朋友

分类: Python/Ruby

2022-01-05 21:08:50

 #/usr/bin/python

# -*- coding: utf-8 -*-

print('Hello World.')



#-----------------------------

mystr = "\n"   # a newline character

mystr = r"\n"  # two characters, \ and n

#-----------------------------

mystr = "Jon 'Maddog' Orwant"  # literal single quote inside double quotes

print mystr

mystr = 'Jon "Maddog" Orwant'  # literal double quote inside single quotes

print mystr

#-----------------------------

mystr = 'Jon \'Maddog\' Orwant'  # escaped single quote

print mystr

mystr = "Jon \"Maddog\" Orwant"  # escaped double quote

print mystr

#-----------------------------

mystr = """

    This is a multiline string literal

    enclosed in triple double quotes.

    """

#mystr = "I want to see if " will be shown.\n"

#print('mystr = """ will be shown as:')

#MC:failed

mystr = '''

    And this is a multiline string literal

    enclosed in triple single quotes.

    '''

#mystr = 'I want to see if ' will be shown.\n'

#print('mystr = """ will be shown as:')

#MC:failed

#-----------------------------



print('\n--------\n This is test for List\n---------\n')


MC_list=['Rob','Tyler','Ahmed']


print ('My Language partners are:')

print(MC_list[2])


#print('I have',len(MC_list),'language partners in total')

print('My last is:')

print(MC_list[len(MC_list)-1])

print(len(MC_list)-1)

print(MC_list[-1])


print('I have new language partners now:')


MC_list.append('Chritine')


print ('My Language partners are:')

print(MC_list)


MC_list.insert(2,'Ken')


print ('My Language partners are:')

print(MC_list)


MC_list.pop()


print ('My Language partners are:')

print(MC_list)


MC_list.pop(2)


print ('My Language partners are:')

print(MC_list)


print('\n------\nITs time for Tutle.\n----\n')


MC_t1=('M1','M2','M3')

print(MC_t1)

MC_t2=(3,)

print(MC_t2)


MC_t3=('MC3')

print(MC_t3)



print('\n------\nITs time for Conditions:\n----\n')


age=42

print('How Old are you?')

#age=input()

if age<=40:

   print('you are',age,'years old.You must be uslesss')

   print('But you still have lots of opportunities.')

elif age<=41:

   print('No worries, you might still have chance in your life')

else:

   print("you are",age," years old alreadt. You are as good as dead.")




print('\n------\nITs time for Loops:\n----\n')

print ('My Language partners in for--in loop are:')

for MC_for in MC_list:

    print(MC_for)


# to add 1 - 10


sum=0

for i in (1,2,3,4,5,6,7,8,9,10):

   sum=sum+i

print('Now,time to show the turth,1++10 is:')

print(sum)


sum=0

for i in range(101):

    #    print(i)

    sum=sum+i

print('Now,time to show the turth,1++100 is:')

print(sum)



print ('The total of even integer numbers between 0-100 is:')

sum=0

number=100


while number>0:

    sum=sum+number

    number=number-2

print(sum)



print ('The total of odd integer numbers between 0-100 is:')

sum=0

number=99


while number>0:

    sum=sum+number

    number=number-2

print(sum)


print ('To demestrate the function of continue in a while loop')

print ('The total of odd integer numbers between 0-100 is:')

sum=0

number=100

while number>0:

    number=number-1

    if number % 2 == 0:

        continue

    sum=sum+number

print(sum)





print('\n------\nIt\'s time for dict:\n----\n')


MC_dict={'Ken':62,'Ahmed':52,'Robert':39,'Tyler':35}


print("Hello Tyler,how old are you?")

print(MC_dict['Tyler'])


print('use "in" to test if a key exist.')

if 'Ken' in MC_dict:

    print('Hello Ken, you are:')

    print(MC_dict['Ken'])

else:

    print('no Ken1 in thd dict.Plese double check.')



print('use "get" to test the existence or to insert an element if notavaliable.')

if MC_dict.get('Ken1'):

    print('Hello Ken, you are:')

    print(MC_dict['Ken'])

else:

    print(MC_dict.get('Ken1',63))

print('Hello Ken1, You are getting older,hahaha.')

#print(MC_dict['Ken1'])




print('\n------\nIt\'s time for set:\n----\n')

MC_set=set([1,2,3,4,5,6,6,6,4,3])

#PUTPUT:set([1, 2, 3, 4, 5, 6])

print('This is  Set MC_set. its elemesnt are:')

print(MC_set)

print('I am going to add new elment. I\'m going to add many times. But i guess it won\'y work?')

MC_set.add('Vert')

MC_set.add('Rough')

MC_set.add('Vert')

MC_set.add('Rough')

MC_set.add('Rough')

MC_set.add(8)

MC_set.add(7)

MC_set.add(7)

MC_set.add(7)

print(MC_set)

#=== OUTPUT:set([1, 2, 3, 4, 5, 6, 7, 8, 'Rough', 'Vert'])

print('to remove with function remove:')

MC_set.remove(7)

print(MC_set)


print('To use set to realise the AND and OR:')

MC_set1=set([10,20,30,40,50,60])

MC_set2=set([10,70])

print("NOW Either")

##10

print(MC_set1 | MC_set2)

print('NOW BOTH')

print(MC_set1 & MC_set2)

##set([50, 20, 70, 40, 10, 60, 30])

MC_set1=set(['Bleu','Rough','Rough','Black'])

MC_set2=set(['Black','Red'])

print("NOW Either")

print(MC_set1 | MC_set2)

#set(['Bleu', 'Rough', 'Black', 'Red'])

print('NOW BOTH')

print(MC_set1 & MC_set2)

# Black


print('你可以支持中文吗?')


##2021,11,14

print('\n------\nIt\'s time for Funtions:\n----\n')

print('\n------\nIt\'s time for abs,max,min :\n----\n')


print(abs(-23))

print(min(1,3,5,4,2,4,3,2,3,3))

print(max(1,3,5,4,2,4,3,2,3,3,95736))


def MC_abs(x):

    if x>0:

        return x

    else:

        return -x


print ("-256 abs is:")

print(MC_abs(-256))


print('\n------\nIt\'s time for None function:pass:\n----\n')


def MC_non():

    pass


MC_pass=42

if MC_pass>42:

    pass

else:

   print('You are so old.')



print('checking canshu:')

print(abs(-23))

#print(abs('-23'))

print('And how about my funtion MC_abs?')

print(MC_abs('-256'))  # NON, it doesnt cheak type... BAD bad bad.



print('To have more than one returns')

import math

def MC_move(x,y,step,angle=0):

    mc_x=x+step*math.cos(angle)

    mc_y=y-step+math.sin(angle)

    return mc_x,mc_y

print (MC_move(60,80,30,math.pi/7))

print(math.pi)


# positional arguments:

print ('The square of x:')

def MC_power(x):

    return x*x

print(MC_power(5))


# to define two positional arguments to handle any times power .

print ('The power of x:')

def MC_power(x,n):

    s=1

    while n>0:

        n=n-1

        s=s*x

    return s

print(MC_power(2,12))


# the default argument:

print ('The default argument in power function :')

def MC_power(x,n=2):

    s=1

    while n>0:

        n=n-1

        s=s*x

    return s

print(MC_power(2,9))

print(MC_power(9))


# to calcuate the total of square of a2+b2...."

print(" the total of square of a2+b2(1-10)....")

def MC_cal_sqr(numbers):

    s=0

    for n in numbers:

        s=s+n*n

    return s

print(MC_cal_sqr([1,2,3,4,5,6,7,8,9,10]))


# to upgrade this funtion using chaning? argument *

print(" the total of square of (1-10) with using various arguments....")

def MC_cal_sqr(*numbers):

    s=0

    for n in numbers:

        s=s+n*n

    return s

print(MC_cal_sqr(1,2,3,4,5,6,7,8,9,10))


# to change a list of items into a various argument.

print('to change a list of items into a various argument *')

chaning_list=[1,2,3,4,5,6,7,8,9,10]

print(MC_cal_sqr(*chaning_list))



#key arguments **

print('Key Arguments:')

def MC_keyv(name,age,**extra):

    print('name:',name, 'age:' ,age, 'other:', extra)

print(MC_keyv('Tyler','34',City='US',Hobby='eating'))

# to use dict as a key argument:

MC_extra={'City':'Beijing','job':'waiting for Death','Hope':'Nothing'}

print(MC_keyv('MMCC','42',**MC_extra))


# to check if the key argument exsits:

def MC_keyv(name,age,**extra):

    if 'City' in extra:

        pass

    if 'Hobby' in extra:

        pass

    print('name:',name, 'age:' ,age, 'other:', extra)

print(MC_keyv('Tyler','34',City='US',Hobby='eating'))


# to limit that only the listed argument are allowed

#def MC_keyv(name,age,*,City,Hobby):

#    print('name:',name,'age:',age,'City:'City,'Hbby:',Hobby)

#print(MC_keyv('Tyler','34',City='US',Hobby='eating'))



print('\n------\nIt\'s time for 递归:\n----\n')


def fact(n):

    if n==1:

        return 1

    return n*fact(n-1)


print ('Fact(4) is:')

print(fact(4))



print('\n------\nIt\'s time for 切片 slice:\n----\n')


List_Slice=['Rough','Bleu','Blanc','Noir','Pink','Purple','Green']

print("The referring elements of List_Slience is:",List_Slice[-5:-4])


#0-99

List_Slice=range(100)

#前十个元素

print("The referring elements of List_Slience is:",List_Slice[0:10])

print("The referring elements of List_Slience is:",List_Slice[-20:-1])

#取倒数9个

print("The referring elements of List_Slience is:",List_Slice[-9:])

#前20个,每三个取一个

print("The referring elements of List_Slience is:",List_Slice[:20:3])

#所有列,每6个取一个

print(" one per six:",List_Slice[::6])

#to copy the whole list:

print(List_Slice[:])


#直接操作字符串:打出前三个字符

print('ABCDEFG'[0:3])

#output: ABC




print('\n------\nIt\'s time for 迭代Iteration:\n----\n')


#  迭代list  用for in 的方式

List_Iteration=range(5)

for i in List_Iteration:

    print(i)

print('\n')


#迭代 dict  默认为 key:

Dict_Iteration={'Ken':'Aus','Rob':'Bri','Ahmed':'Fra','Tyler':'US'}

for key in Dict_Iteration:

    print(key)

print('\n')

# 迭代 dict 中的value:

for value in Dict_Iteration.values():

    print(value)

print('\n')

#迭代 dict 中的key anb value:

for key,value in Dict_Iteration.items():

    print(key,value)


#迭代字符串

for str_m2 in 'HelloWorldBonjourleMonde':

    print(str_m2)


#测试可否迭代。 测试失败,来日方长。

#from collections.abc import Iterable

#print(isinstance('ABC',Iterable))


#实现迭代时的下标问题:enumerate

for i,str_3 in enumerate('BONJOUR'):

    print(i,str_3)


# 同时引用两个变量。

for i,j in [(1,4),(2,8),(3,12)]:

    print(i,j)



###列表生成式 List Comprehensions

print('\n------\nIt\'s time for 列表生成式 List Comprehensions:\n----\n')


# to generate 1,2,....11 range(1,11)


print('to generate intergers with range.\n')

#0-4:

print(range(5))

#1-5:

print(range(1,6))

# to generate 1*1,2*2...11*11 用循环

L=[]

for i in range(1,12):

    L.append(i*i)

print(L)

#1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121


#不用循环,用列表生成式 ,达到上方结果

L=[x*x for x in range(1,12)]

print(L)

#output: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121


#try again. 2x+5

L=[2*x+5 for x in range(1,11)]

print(L)

#7, 9, 11, 13, 15, 17, 19, 21, 23, 25


# to add a conditional to get the odd numbers.

L=[x*x for x in range(1,11) if x%2==0]

print(L)

#4, 16, 36, 64, 100  (that is: 2,4,6,8,10)


# To get two combinded elements:

L=[m+n for m in 'ABC' for n in 'EDF']

print(L)


#

D={'A':'Y','B':'N','C':'NA'}

L=[k+'='+v for k,v in D.items()]

print(L)

#'A=Y', 'C=NA', 'B=N'

# to lowcase letters.


L=['Bonjour','le','Monde']

print(L)

#print(s.lower() for s in L) ATTENYTION: ERROR: at 0x1031c62d0>

print([s.lower() for s in L])



print('\n------\nIt\'s time for 生成器generator:\n----\n')

#to define a genertor by using () instead of [] of a List

G=(x*x for x in range(1,11) if x%2==0)

print(G)


# to print the element of a generator.: next()

#(next(G))

#print(next(G))

#print(next(G))

#print(next(G))


# It's more sensible and more common to use for loop to list the element:

for n in G:

    print(n)


# to realise Fibonacci with function: 1 1 2 3 5 8 13 21....

def Fib(max):

    n,a,b=0,1,1

    while n

        print(a)

        a,b=b,a+b

        n=n+1

    return 'done_Function\n'

print(Fib(6))


# to transfer the above funtion to operation:

def Fib(max):

    n,a,b=0,1,1

    while n

        yield a

        a,b=b,a+b

        n=n+1

#return 'done' 加这句就报错。

print(Fib(6))


#define wield.

def wield():

    print('First:')

    yield '  un'

    print('Second:')

    yield '  deux'

    print('Thrid:')

    yield '  trois-Done\n'

w=wield()

print(next(w))

print(next(w))

print(next(w))

print('------\n')

print(next(wield()))

print(next(wield()))

print(next(wield()))


# to catch exception with try--exception:

'''def Fib1(max):

    n,a,b=0,1,1

    while n

        yield a

        a,b=b,a+b

        n=n+1

    return 'FIN'

G=Fib1(8)

while True:

    try:

        x=next(G)

    except StopIteration as e:

        print('The Generator return value:',e.value)

        break

'''

print('The next page.')


# to test Iterable:

from collections import Iterable

print(isinstance([],Iterable))

print(isinstance({},Iterable))

print(isinstance('ABC',Iterable))

print(isinstance([x*x for x in range(11)],Iterable))

print(isinstance(100,Iterable))

print('\n')


#to test Iterator

from collections import Iterator


print(isinstance((x*x for x in range(11)),Iterator))

print(isinstance([x*x for x in range(11)],Iterator))

print(isinstance([],Iterator))

print(isinstance({},Iterator))

print(isinstance('ABC',Iterator))


print('\n')


# to transer interable to intertor:

print(isinstance(iter([]),Iterator))

print(isinstance(iter({}),Iterator))



print('\n------\nIt\'s time for 高阶函数:Higher-order function:\n----\n')


print(abs(-300))

print(abs)


#高级函数,就是把另一个函数作为参数来调用。函数套函数

f=abs

def absolutely_add(x,y,f):

    result=f(x)+f(y)

    return result

print(absolutely_add(3,-4,f))


'''

 报错。你说是为什么?

f=lower

def change_upper(s,f):

    result=f(s)

    return result

print(change_upper('Bonjour',f))

'''


print(list)


print('\n------\nIt\'s time for map:\n----\n')



def f(x):

    return x*x

L=map(f,[1,2,3,4,5,6,7,8])

print(L)


#reduce(f, [x1, x2, x3, x4]) = f(f(f(x1, x2), x3), x4)

print(reduce)

# 1+2+3+4+5

def add_map(x,y):

    return x+y

print(reduce(add_map,[1,2,3,4,5]))


#reduce for 13579

def fn(x,y):

    return x*10+y

print(reduce(fn,[1,3,5,7,8,9]))

def chartonum(s):

    dig={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8': 8,'9': 9}

    return dig[s]

print(chartonum('7'))

print(map(chartonum,'13456'))

print(reduce(fn,map(chartonum,'13456')))


# 整理一下,形成一个很酷的函数,叫strtoint

print('函数strtoint,可以吧字符转成整数')

from functools import reduce

dig={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8': 8,'9': 9}

def strtoint(s):

    def fn(x,y):

        return x*10+y

    def chartonum(s):

        return dig[s]

    return reduce(fn,map(chartonum,s))

print(strtoint('23456'))


print('\n------\nIt\'s time for filter:\n----\n')


def Isaodd(i):

    if i % 2 == 0:

        return i

print(list(filter(Isaodd,[1,2,3,4,5,6,7,8,10,15,14,24,45])))


'''

def non_space(s):

    return s and s.strip()

print(non_space(['A','B','',' ','C']))

'''


print('\n------\nIt\'s time for sorted:\n----\n')


print(sorted([12,24,34,13,45,-23,896,-345]))


print(sorted([12,24,34,13,45,-23,896,-345],key=abs))


print(sorted(['Ken','rob','Tyler','ahmed','Sophie','laurence']))


#str_m=['Ken','rob','tyler','ahmed','Sophie','laurence']

print(sorted(['Ken','rob','Tyler','ahmed','Sophie','laurence'], key=str.lower))

#print(sorted("This is a test string from Andrew".split(), key=str.lower))

print(sorted(['Ken','rob','Tyler','ahmed','Sophie','laurence'], key=str.lower,reverse=True))



L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]

from operator import itemgetter

L2 = sorted(L, key=itemgetter(0))

print(L2)

L3 = sorted(L, key=itemgetter(1))

print(L3)

L4 = sorted(L, key=lambda t: t[1])

print(L4)

L5 = sorted(L, key=itemgetter(1), reverse=True)

print(L5)



print('\n------\nIt\'s time for return a function:\n----\n')


def calc_sum(*argc):

    ax=0

    for n in argc:

        ax=ax+n

    return ax

print(calc_sum(1,2,3,4,5))


def lazy_sum(*argc):

    def calc_sum():

        ax=0

        for n in argc:

            ax=ax+n

        return ax

    return calc_sum

print(lazy_sum(5,8))

f=lazy_sum(5,8)

print(f())

print(lazy_sum(5,8)())


print('\n------\nIt\'s time for anonymous functions.:\n----\n')

print(list(map(lambda x: x * x, [1, 2, 3, 4, 5, 6, 7, 8, 9])))


# To define an anonymous function to a defined function.

f_mei=lambda x: x*x*x

print(f_mei)

print(f_mei(2))


print('-------')

#

def fr_m(x):

    # tmp=lambda : x*x

    # return tmp()

    return lambda: x*x

'''    def tmp():

        return x*x

    return tmp()


def build(x, y):

    return lambda: x * x + y * y

print(build(2,3))

'''


print(fr_m(2))

print('-------')

List_dec=list(filter(lambda x:x % 2 ==1,range(1,20)))

print(List_dec)



print('\n------\nIt\'s time for partial functions.:\n----\n')


print (int('12306'))

print (int('12306',base=8))

print (int('12306',16))

'''

def int2(x,base=2):

    return int(x,base)


print(int2('101010'))

print(int2('11111'))

print(int2('100000000'))

'''


import functools

int2=functools.partial(int,base=2)


print(int2('101010'))

print(int2('11111'))

print(int2('100000000'))


print(int2('100000',base=10))


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