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[Python֪ʶ¿â]Pythonѧϰ±Ê¼Ç£º13 º¯ÊýºÍÄ£¿é

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³ÌÐòÔ±×Ô¼ºÉùÃ÷µÄº¯Êý¡£

º¯ÊýµÄÉùÃ÷

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def fac(num):
    """Çó½×³Ë"""
    result = 1
    for i in range(2, num + 1):
        result *= i
    return result

˵Ã÷:Python±ê×¼¿âµÄmathÄ£¿éÖÐÓÐÒ»¸öÃûΪfactorialµÄº¯ÊýÒѾ­ÊµÏÖÁËÇó½×³ËµÄ¹¦ÄÜ,ÎÒÃÇ¿ÉÒÔÖ±½ÓʹÓøú¯ÊýÀ´¼ÆËã½×³Ë¡£

º¯ÊýµÄ²ÎÊý

ÔÚ¶¨Ò庯Êýʱ,¿ÉÒÔÓвÎÊý,Ò²¿ÉÒÔ²»¼Ó²ÎÊý,²ÎÊý»¹¿ÉÒÔÖ¸¶¨Ä¬ÈÏÖµ,Èç¹ûûÓд«Èë¸Ã²ÎÊýµÄÖµ,¾ÍʹÓÃĬÈÏÖµ¡£

def add(a=0, b=0, c=0):
    """Èý¸öÊýÏà¼ÓÇóºÍ"""
    return a + b + c


# µ÷ÓÃaddº¯Êý,ûÓд«Èë²ÎÊý,ÄÇôa¡¢b¡¢c¶¼Ê¹ÓÃĬÈÏÖµ0
print(add())         # 0
# µ÷ÓÃaddº¯Êý,´«ÈëÒ»¸ö²ÎÊý,ÄÇô¸Ã²ÎÊý¸³Öµ¸ø±äÁ¿a, ±äÁ¿bºÍcʹÓÃĬÈÏÖµ0
print(add(1))        # 1
# µ÷ÓÃaddº¯Êý,´«ÈëÁ½¸ö²ÎÊý,1ºÍ2·Ö±ð¸³Öµ¸ø±äÁ¿aºÍb,±äÁ¿cʹÓÃĬÈÏÖµ0
print(add(1, 2))     # 3
# µ÷ÓÃaddº¯Êý,´«ÈëÈý¸ö²ÎÊý,·Ö±ð¸³Öµ¸øa¡¢b¡¢cÈý¸ö±äÁ¿
print(add(1, 2, 3))  # 6
# ´«µÝ²ÎÊýʱ¿ÉÒÔ²»°´ÕÕÉ趨µÄ˳Ðò½øÐд«µÝ,µ«ÊÇÒªÓá°²ÎÊýÃû=²ÎÊýÖµ¡±µÄÐÎʽ
print(add(c=50, a=100, b=200))    # 350

×¢Òâ:´øĬÈÏÖµµÄ²ÎÊý±ØÐë·ÅÔÚ²»´øĬÈÏÖµµÄ²ÎÊýÖ®ºó,·ñÔò½«²úÉúSyntaxError´íÎó,´íÎóÏûÏ¢ÊÇ:non-default argument follows default argument,·­Òë³ÉÖÐÎĵÄÒâ˼ÊÇ¡°Ã»ÓÐĬÈÏÖµµÄ²ÎÊý·ÅÔÚÁË´øĬÈÏÖµµÄ²ÎÊýºóÃ桱¡£

¿É±ä²ÎÊý

ʹÓÿɱä²ÎÊý¿ÉÒÔʵÏÖÏòÒ»¸öº¯ÊýÖд«0¸ö»òÈÎÒâ¶à¸ö²ÎÊý,PythonÖпÉÒÔͨ¹ý*±í´ïʽÓï·¨À´Ö§³Ö¿É±ä²ÎÊý¡£ÏÂÃæµÄ´úÂëÑÝʾÁËÓÿɱä²ÎÊýʵÏÖ¶ÔÈÎÒâ¶à¸öÊýÇóºÍµÄaddº¯Êý¡£

# ¿É±ä²ÎÊý:¿ÉÒÔ½ÓÊÕ0¸ö»òÈÎÒâ¶à¸öλÖòÎÊý
def add(*args):
    total = 0
    for arg in args:
        if type(arg) in (int, float):
            total += arg
    return total


print(add())
print(add(1, 2))
print(add(1, 2, 3))

ÓÃÄ£¿é¹ÜÀíº¯Êý

º¯ÊýÃüÃû³åÍ»µÄ³¡¾°:ÔÚͬһ¸ö.pyÎļþÖж¨ÒåÁËÁ½¸öͬÃûµÄº¯Êý

def say_hello():
    print('hello,world')


def say_hello():
    print('goodbye,world')
    

say_hello()     # Êä³ögoodbye,world

PythonÖÐÿ¸öÎļþ¾Í´ú±íÁËÒ»¸öÄ£¿é(module),ÔÚ²»Í¬Ä£¿é¿ÉÒÔÓÐͬÃûµÄº¯Êý,ÔÚʹÓú¯Êýʱ,ͨ¹ýimport¹Ø¼ü×Öµ¼ÈëÖ¸¶¨µÄÄ£¿éÔÙʹÓÃÍêÈ«ÏÞ¶¨ÃûµÄµ÷Ó÷½Ê½¾Í¿ÉÒÔÇø·ÖÊÇÄĸöÄ£¿éÖеÄsay_helloº¯Êý¡£´úÂëÈçÏÂ:

module1.py

def say_hello():
    print('hello,world')

module2.py

def say_hello():
    print('goodbye,world')

test.py

import module1
import module2

# Óá°Ä£¿éÃû.º¯ÊýÃû¡±µÄ·½Ê½(ÍêÈ«ÏÞ¶¨Ãû)µ÷Óú¯Êý
module1.say_hello()     # hello,world
module2.say_hello()     # goodbye,world

ÔÚµ¼ÈëÄ£¿éʱ,»¹¿ÉÒÔʹÓùؼü×Öas¶ÔÄ£¿éÈ¡±ðÃû¡£

test.py

import module1 as m1
import module2 as m2

m1.say_hello()    # hello,world
m2.say_hello()    # goodbye,world

ÉÏÃæµÄ´úÂëÎÒÃǵ¼ÈëÁ˶¨Ò庯ÊýµÄÄ£¿é,ÎÒÃÇÒ²¿ÉÒÔʹÓÃfrom...import...Óï·¨´ÓÄ£¿éÖÐÖ±½Óµ¼ÈëÐèҪʹÓõĺ¯Êý,´úÂëÈçÏÂËùʾ¡£

test.py

from module1 import say_hello
say_hello()                      # hello,world
from module2 import say_hello
say_hello()                      # goodbye,world

Èç¹ûÎÒÃÇÈç¹û´ÓÁ½¸ö²»Í¬µÄÄ£¿éÖе¼ÈëÁËͬÃûµÄº¯Êý,ºóµ¼ÈëµÄº¯Êý»á¸²¸ÇµôÏÈÇ°µÄµ¼Èë,¾ÍÏñÏÂÃæµÄ´úÂëÖÐ,µ÷ÓÃsay_hello»áÊä³öhello, world!,ÒòΪÎÒÃÇÏȵ¼ÈëÁËmodule2µÄsay_hello,ºóµ¼ÈëÁËmodule1µÄsay_hello ¡£

from module2 import say_hello
from module1 import say_hello
say_hello()                   # hello,world

Èç¹ûҪͬʱʹÓÃÀ´×ÔÁ½¸öÄ£¿éµÄsay_helloº¯Êý,Óùؼü×Ö¶Ôµ¼ÈëµÄº¯ÊýÈ¡±ðÃû¡£

from module1 import say_hello as f1
from module2 import say_hello as f2

f1()       # hello,world
f2()       # goodbye,world

²»Í¬Îļþ¼Ðϲ»Í¬Ä£¿éÖ®¼äµÄµ÷ÓÃ

н¨Ò»¸ö°ü,°üÃûΪdemo,ÔÚ°üÀïн¨.pyÎļþ,дÈëÒÔÏ´úÂë

homework5.py

"""
homework5 - Éè¼Æº¯Êý,´«ÈëÒ»¸öÁбí(ÁбíÖÐÊÇÒ»×éÑù±¾Êý¾Ý),
¼ÆËãÑù±¾Êý¾ÝµÄ¾ùÖµ¡¢ÖÐλÊý¡¢¼«²î(×î´óÖµºÍ×îСֵµÄ²î)¡¢·½²î¡¢±ê×¼²î
Author: yucui
Date: 2021/8/2
"""
import random


def ptp(nums):
    """Ç󼫲î(È«¾à)"""
    return max(nums) - min(nums)


def average(nums):
    """Çó¾ùÖµ"""
    return sum(nums) / len(nums)


def variance(nums):
    """Çó·½²î"""
    x_bar = average(nums)
    total = 0
    for num in nums:
        total += (x_bar - num) ** 2
    return total / (len(nums) - 1)


def std(nums):
    """Çó±ê×¼²î"""
    return variance(nums) ** 0.5


def median(nums):
    """ÇóÖÐλÊý"""
    temp = sorted(nums)
    size = len(temp)
    if size % 2 == 0:
        return (temp[size // 2] + temp[size // 2 - 1]) / 2
    else:
        return temp[size // 2]


# __name__ÊÇÒ»¸öÒþ²Ø±äÁ¿,Ëû´ú±íÁ˵±Ç°Ä£¿é(Îļþ)µÄÃû×Ö
# Èç¹ûÖ±½Óͨ¹ýPython½âÊÍÆ÷ÔËÐÐhomework5.pyÕâ¸öÎļþ,__name__µÄÖµÊÇ__main__
# Èç¹ûÊÇÔÚÆäËüÄ£¿é(Îļþ)Öе¼ÈëÁËhomework5,´Ëʱ__name__µÄÖµÊÇhomework5
if __name__ == '__main__':
    nums_list = [random.randrange(1, 100) for _ in range(10)]
    print(nums_list)
    print(f'¾ùÖµ:{average(nums_list)}')
    print(f'ÖÐλÊý:{median(nums_list)}')
    print(f'¼«²î:{ptp(nums_list)}')
    print(f'·½²î:{variance(nums_list)}')
    print(f'±ê×¼²î:{std(nums_list)}')

×¢:__name__ÊÇÒ»¸öÒþ²Ø±äÁ¿,Ëû´ú±íÁ˵±Ç°Ä£¿é(Îļþ)µÄÃû×Ö,Èç¹ûÖ±½Óͨ¹ýPython½âÊÍÆ÷ÔËÐÐhomework5.pyÕâ¸öÎļþ,__name__µÄÖµÊÇ__main__,Èç¹ûÊÇÔÚÆäËüÄ£¿é(Îļþ)Öе¼ÈëÁËhomework5,´Ëʱ__name__µÄÖµÊÇhomework5

ÔÙн¨Ò»¸ö°ü,ÃüÃûutils,ÔÚÕâ¸ö°üÏÂн¨Ò»¸öpythonÎļþexample05.py,ÔÚÕâ¸öÄ£¿éÖе÷ÓÃÉÏÃæµÄÄ£¿é,´úÂëÈçÏÂ:

import random
from demo import homework5

class_a_scores = [random.randrange(50, 101) for _ in range(50)]
class_b_scores = [random.randrange(50, 101) for _ in range(50)]
print('A°à¿¼ÊԳɼ¨ÃèÊöÐÔͳ¼ÆÐÅÏ¢')
print(f'ƽ¾ù·Ö:{homework5.average(class_a_scores)}')
print(f'ÖÐλÊý:{homework5.median(class_a_scores)}')
print(f'·½²î:{homework5.variance(class_a_scores)}')
print(f'±ê×¼²î:{homework5.std(class_a_scores)}')

print('B°à¿¼ÊԳɼ¨ÃèÊöÐÔͳ¼ÆÐÅÏ¢')
print(f'ƽ¾ù·Ö:{homework5.average(class_b_scores)}')
print(f'ÖÐλÊý:{homework5.median(class_b_scores)}')
print(f'·½²î:{homework5.variance(class_b_scores)}')
print(f'±ê×¼²î:{homework5.std(class_b_scores)}')

ΪʵÏÖÎļþºó׺ÃûµÄ»ñÈ¡,ÔÚ°üutilsµÄ__init__.pyÖÐдÈëÏÂÃæµÄ´úÂë

# дÔÚ*Ç°µÄ²ÎÊýΪλÖòÎÊý,´«²Îʱ,Ö»ÐèÒª¶ÔºÅÈë×ù
# *ºóÃæµÄ²ÎÊýΪÃüÃû¹Ø¼ü×Ö²ÎÊý,²ÎÊýÐÎʽ±ØÐëд³É¡°²ÎÊýÃû=²ÎÊýÖµ¡±
def get_suffix(file_name, *, has_point=False):
    """ÕÒÎļþºó׺Ãû

    :param file_name: ´«ÈëµÄÎļþÃû
    :param has_point: ÊÇ·ñ¼ÓÉϵã
    :return: ºó׺Ãû
    """
    find_index = file_name.rfind('.')
    if find_index == 0 or find_index == len(file_name) - 1 or find_index == -1:
        return ''
    else:
        if has_point:
            return file_name[find_index:]
        else:
            return file_name[find_index + 1:]

ÔÚ°üdemoÏÂн¨Ò»¸öpythonÎļþ,find.py,ÔÚÆäÖе÷ÓÃÉÏÊö´úÂë:

import utils

print(utils.get_suffix('hello.py.txt', has_point=True))
print(utils.get_suffix('hello.py.', has_point=True))
print(utils.get_suffix('hello'))
print(utils.get_suffix(has_point=True, file_name='.hello'))
print(utils.get_suffix(has_point=True, file_name='hello.py'))

Ö»ÐèÒªµ¼Èë__init__.pyËùÔڵİü¼´¿É¡£

±ê×¼¿âÖеÄÄ£¿éºÍº¯Êý

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chr½«Unicode±àÂëת»»³É¶ÔÓ¦µÄ×Ö·û,ÀýÈç:chr(8364)»á·µ»Ø'€'¡£
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input´ÓÊäÈëÖжÁÈ¡Ò»ÐÐ,·µ»Ø¶Áµ½µÄ×Ö·û´®¡£
len»ñÈ¡×Ö·û´®¡¢ÁбíµÈµÄ³¤¶È¡£
max·µ»Ø¶à¸ö²ÎÊý»òÒ»¸ö¿Éµü´ú¶ÔÏó(ºóÃæ»á½²)ÖеÄ×î´óÖµ,ÀýÈç:max(12, 95, 37)»á·µ»Ø95¡£
min·µ»Ø¶à¸ö²ÎÊý»òÒ»¸ö¿Éµü´ú¶ÔÏó(ºóÃæ»á½²)ÖеÄ×îСֵ,ÀýÈç:min(12, 95, 37)»á·µ»Ø12¡£
oct°ÑÒ»¸öÕûÊýת»»³ÉÒÔ'0o'¿ªÍ·µÄ°Ë½øÖÆ×Ö·û´®,ÀýÈç:oct(123)»á·µ»Ø'0o173'¡£
open´ò¿ªÒ»¸öÎļþ²¢·µ»ØÎļþ¶ÔÏó(ºóÃæ»á½²)¡£
ord½«×Ö·ûת»»³É¶ÔÓ¦µÄUnicode±àÂë,ÀýÈç:ord('€')»á·µ»Ø8364¡£
powÇóÃÝÔËËã,ÀýÈç:pow(2, 3)»á·µ»Ø8pow(2, 0.5)»á·µ»Ø1.4142135623730951¡£
print´òÓ¡Êä³ö¡£
range¹¹ÔìÒ»¸ö·¶Î§ÐòÁÐ,ÀýÈç:range(100)»á²úÉú0µ½99µÄÕûÊýÐòÁС£
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type·µ»Ø¶ÔÏóµÄÀàÐÍ,ÀýÈç:type(10)»á·µ»Øint;¶øtype('hello')»á·µ»Østr¡£

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»¹ÓÐÒ»¸öÔ­ÔòÊǵÍñîºÏ,¼´º¯ÊýÄÚ¾¡Á¿²»ÒªÊ¹ÓÃprintºÍinputÓï¾ä¡£

ÀýÈçÓú¯ÊýʵÏÖÇóÁ½¸öÊýµÄ×î´ó¹«Ô¼ÊýºÍ×îС¹«±¶Êý(Éè¼ÆÁ½¸öº¯Êý·Ö±ðÇó×î´ó¹«Ô¼ÊýºÍ×îС¹«±¶Êý)

def gcd(m, n):
    """Çó×î´ó¹«Ô¼Êý"""
    while n % m != 0:
        m, n = n % m, m
    return m


def lcm(m, n):
    """Çó×îС¹«±¶Êý"""
    return m * n // gcd(m, n)


a = int(input('a = '))
b = int(input('b = '))
print(gcd(a, b), lcm(a, b))
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