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• 只要重寫了 __str__()方法，不管是打印對象還是打印對象的字符串格式，其調(diào)用的都是 __str__()方法，所以顯示的都是重寫的__str__()結(jié)果。也就是說，print(str(obj)) 和 print(obj) 是一樣的。

• 而只有在控制臺（window下的cmd，命令提示符）中，在python環(huán)境下直接輸入（不是打印）obj，回車，調(diào)用的才是 __repr__()方法。如果沒有重寫該方法，還是會顯示對象所在的地址。

__count是類屬性，如果將print(dog.__count)放到cat對象建立后面，將打印出2.因為cat對象建立后，Animal的屬性__count就變了，dog能訪問__count屬性，所以就變了。

# Enter a code

from functools import reduce

result =? [item for item in map(lambda x:x*x,[1,2,3,4,5,6])]

print (result)

print reduce(lambda x,y:x+y,[1,3,5,7,9])

print sorted(['bob','MD','22A','QQ','mm'],key=lambda item:item.lower(),reverse = True)

# Enter a code

L=[2,4,1,45,12,33,11,44,21]

K=['aad','']

print sorted(L)

def k(item):

? ? return item.lower()

print sorted(['Bod','UUU1PPP','qqasd'],key=k ,reverse=True)

2我為1wee

# Enter a code

import math

def is_odd(x):

? ? return x%2 ==1

? ??

for item in filter(is_odd,[1,6,9,54,52,2,4,8,7]):

? ? print(item)

def? is_empty(s):

? ? ?return s? ?and len(s.strip())>0

L =['te? st',None,'? str','','? ','END']? ??

for item1 in filter (is_empty,L):

? ? print(item1)

def sqr(x):

? ? r = int(math.sqrt(x))

? ? return r*r == x

for item2 in filter(sqr,(range(1,101))):

? ? print item2

from functools import reduce

def f(x,y):

? ? return x*y

print(reduce(f,[1,3,5,7,9,12,4,5,100,7894,7896321,789456123]))

# Enter a code

import math

def? add(x,y,f):

? ? return f(x)+f(y)

print(add(81,64,math.sqrt))

python -m http.server 9999 -d C:/

lass op(object):
? ?def ok(num):
? ? ? ?f = open('ok1.txt',mode='a') #讀取中文
? ? ? ?f.writelines('\n'+num)
? ? ? ?f.close()
? ? ? ?e = open('ok81.txt',mode='a+')
? ? ? ?e.writelines(num+'\n')
? ? ? ?e.close();
? ? ? ?gl = open('ok81.txt',mode='r')

? ? ? ?content = gl.readlines()
? ? ? ?print(content)
? ? ? ?gl.close()

class op(object):
? ?def ok(num):
? ? ? ?f = open('ok1.txt',mode='w') #讀取中文
? ? ? ?f.writelines(num)
? ? ? ?f.close()

import os


class op(object):
? ?def ok(num):
? ? ? ?f = open('ok1.txt', ?encoding='utf-8') #讀取中文

? ? ? ?s = f.read(num)
? ? ? ?l= f.readlines()
? ? ? ?print(s)
? ? ? ?print(l)

? ? ? ?f.close()

線下已實現(xiàn)

#opfile.py

import os
class op(object):
? ?def ok():
? ? ? f = open('ok81.txt', 'x')
? ? ? print ('ok92')
? ? ? f.close()

#main.py

import opfile

# This is a sample Python script.

# Press Shift+F10 to execute it or replace it with your code.
# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.





def print_hi(name):
? ?# Use a breakpoint in the code line below to debug your script.
? ?print(f'Hi, {name}') ?# Press Ctrl+F8 to toggle the breakpoint.


# Press the green button in the gutter to run the script.
if __name__ == '__main__':
? ?print_hi('PyCharm')

# See PyCharm help at https://www.jetbrains.com/help/pycharm/
num = input('pls input the num:'+'\n')
print('this is num is:{}'.format(num))
opfile.op.ok();

class person(object):

? ? def __init__(self,name,gender):

? ? ? ? self.name = name

? ? ? ? self.gender = gender

? ? def __call__(self,friend):

? ? ? ? print('my name is {}...'.format(self.name))

? ? ? ? print('my friend is {}...'.format(friend))

p= person('alice','female')

p('box')

看不懂