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PythonµÄ±ê׼ģ¿é½éÉÜ£ºsys¡¢os¡¢randomºÍtime

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PythonÄÚÖÃÁËÐí¶à±ê׼ģ¿é£¬ÀýÈçsys¡¢os¡¢randomºÍtimeÄ£¿éµÈ£¬ÏÂÃæÎª´ó¼Ò½éÉܼ¸¸ö³£Óõıê׼ģ¿é¡£

1.sysÄ£¿é

sysÄ£¿éÖÐÌṩÁËһϵÁÐÓëPython½âÊÍÆ÷½»»¥µÄº¯ÊýºÍ±äÁ¿£¬ÓÃÓÚ²Ù¿ØPythonµÄÔËÐÐʱ»·¾³¡£sysÄ£¿éÖг£ÓñäÁ¿Ó뺯ÊýÈç±í1Ëùʾ¡£

±í1 sysÄ£¿éµÄ³£ÓñäÁ¿Ó뺯Êý

±äÁ¿/º¯Êý ˵Ã÷
sys.argv »ñÈ¡ÃüÁîÐвÎÊýÁбí£¬¸ÃÁбíÖеĵÚÒ»¸öÔªËØÊdzÌÐò×ÔÉíËùÔÚ·¾¶
sys.version »ñÈ¡Python½âÊÍÆ÷µÄ°æ±¾ÐÅÏ¢
sys.path »ñȡģ¿éµÄËÑË÷·¾¶£¬¸Ã±äÁ¿µÄ³õֵΪ»·¾³±äÁ¿PYTHONPATHµÄÖµ
sys.platform ·µ»Ø²Ù×÷ϵͳƽ̨µÄÃû³Æ
sys.exit() Í˳öµ±Ç°³ÌÐò¡£¿ÉΪ¸Ãº¯Êý´«µÝ²ÎÊý£¬ÒÔÉèÖ÷µ»ØÖµ»òÍ˳öÐÅÏ¢£¬Õý³£Í˳ö·µ»ØÖµÎª0       
ÏÂÃæÍ¨¹ýһЩʾÀýÀ´ÑÝʾsysÄ£¿éÖв¿·Ö±äÁ¿ºÍº¯ÊýµÄÓ÷¨¡£

£¨1£©argv±äÁ¿

ͨ¹ýimportÓï¾äµ¼ÈësysÄ£¿é£¬È»ºó·ÃÎÊargv±äÁ¿»ñÈ¡ÃüÁîÐвÎÊýÁбí£¬¾ßÌå´úÂëÈçÏ£º

import sys
print(sys.argv)

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2.osÄ£¿é

osÄ£¿éÖÐÌṩÁË·ÃÎʲÙ×÷ϵͳ·þÎñµÄ¹¦ÄÜ£¬¸ÃÄ£¿éÖг£Óú¯ÊýÈç±í8-2Ëùʾ¡£

±í2 osÄ£¿éµÄ³£Óú¯Êý

º¯Êý ˵Ã÷
os.getcwd() »ñÈ¡µ±Ç°¹¤×÷·¾¶£¬¼´µ±Ç°Python½Å±¾ËùÔڵķ¾¶
os.chdir() ¸Ä±äµ±Ç°½Å±¾µÄ¹¤×÷·¾¶
os.remove() ɾ³ýÖ¸¶¨Îļþ
os._exit() ÖÕÖ¹Python³ÌÐò
os.path.abspath(path) ·µ»Øpath¹æ·¶»¯µÄ¾ø¶Ô·¾¶
os.path.split(path) ½«path·Ö¸ôΪÐÎÈ磨Ŀ¼£¬ÎļþÃû£©µÄ¶þÔª×é²¢·µ»Ø                                      
ÏÂÃæÍ¨¹ýһЩʾÀýÀ´ÑÝʾosÄ£¿éÖв¿·Öº¯ÊýµÄÓ÷¨¡£

£¨1£©getcwd()º¯Êý

ͨ¹ýosÄ£¿éÖеÄgetcwd()º¯Êý»ñÈ¡µ±Ç°µÄ¹¤×÷·¾¶£¬Ê¾Àý´úÂëÈçÏ¡£

import os
print(os.getcwd()) # »ñÈ¡µ±Ç°µÄ¹¤×÷·¾¶

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D:\PythonÏîÄ¿\Ä£¿éʹÓÃ

£¨2£©exit()º¯Êý

osÄ£¿éÖÐÒ²ÓÐÖÕÖ¹³ÌÐòµÄº¯Êý——_exit()£¬¸Ãº¯ÊýÓësysÄ£¿éÖеÄexit()º¯ÊýÂÔÓв»Í¬¡£Ö´ÐÐosÄ£¿éÖеÄexit()º¯Êýºó£¬³ÌÐò»áÁ¢¼´½áÊø£¬Ö®ºóµÄ´úÂëÒ²²»»áÔÙÖ´ÐУ»¶øÖ´ÐÐsysÄ£¿éÖеÄexit()º¯Êý»áÒý·¢Ò»¸öSystemExitÒì³££¬ÈôûÓв¶»ñ¸ÃÒì³£Í˳ö³ÌÐò£¬ºóÃæµÄ´úÂë²»ÔÙÖ´ÐУ»Èô²¶»ñµ½¸ÃÒì³££¬ÔòºóÐøµÄ´úÂëÈÔÈ»»áÖ´ÐС£¹ØÓÚosºÍsysÄ£¿éµÄexit()º¯ÊýµÄÓ÷¨±È½ÏÈçÏ¡£

ʹÓÃosÄ£¿éÖеÄ_exit()º¯ÊýÖÕÖ¹³ÌÐò£¬Ê¾Àý´úÂëÈçÏ£º

import os
print("Ö´ÐÐ_exit()֮ǰ")
try:
    os._exit(0)
    print("Ö´ÐÐ_exit()Ö®ºó")
except:
    print("³ÌÐò½áÊø")

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Ö´ÐÐ_exit()֮ǰ

ÓÉÒÔÉϽá¹û¿ÉÖª£¬³ÌÐòÔÚÖ´ÐÐÍê“os._exit(0)”´úÂëºóÁ¢¼´½áÊø£¬²»ÔÙÖ´ÐкóÐøµÄ´úÂë¡£

ʹÓÃsysÄ£¿éÖеÄexit()º¯ÊýÖÕÖ¹³ÌÐò£¬Ê¾Àý´úÂëÈçÏ£º

import sys
print("Ö´ÐÐ_exit()֮ǰ")
try:
    sys.exit(0)
    print("Ö´ÐÐ_exit()Ö®ºó")
except:
    print("³ÌÐò½áÊø")

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Ö´ÐÐ_exit()֮ǰ
³ÌÐò½áÊø

ÓÉÒÔÉϽá¹û¿ÉÖª£¬³ÌÐòÖ´ÐÐÍê“sys.exit(0)”´úÂëºóûÓÐÁ¢¼´½áÊø¡£ÓÉÓÚtry×Ó¾äÖв¶»ñÁËSystemExitÒì³££¬Òò´Ëtry×Ó¾äºóÐøµÄ´úÂë²»ÔÙÖ´ÐУ¬¶øÊǼÌÐøÖ´ÐÐÒì³£´¦Àíexcept×Ӿ䡣

£¨3£©chdir ()º¯Êý

osÄ£¿éÖл¹ÌṩÁËÐ޸ĵ±Ç°¹¤×÷·¾¶µÄchdir()º¯Êý£¬Ê¾Àý´úÂëÈçÏ£º

import os
path = r"D:\PythonÏîÄ¿\¾®×ÖÆåV1.0"
# ²é¿´µ±Ç°¹¤×÷Ŀ¼
current_path = os.getcwd()
print(f"ÐÞ¸Äǰ¹¤×÷Ŀ¼Ϊ{current_path}")
# Ð޸ĵ±Ç°¹¤×÷Ŀ¼
os.chdir(path)
# ²é¿´Ð޸ĺóµÄ¹¤×÷Ŀ¼
current_path = os.getcwd()
print(f"Ð޸ĺó¹¤×÷Ŀ¼Ϊ{current_path}")

ÉÏÊö´úÂëÊ×ÏÈʹÓÃgetcwd()º¯Êý»ñÈ¡µ±Ç°µÄ¹¤×÷·¾¶£¬È»ºóͨ¹ýchdir()º¯ÊýÐÞ¸ÄÁ˵±Ç°µÄ¹¤×÷·¾¶¡£

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ÐÞ¸Äǰ¹¤×÷Ŀ¼ΪD:\PythonÏîÄ¿\Ä£¿éʹÓÃ
Ð޸ĺó¹¤×÷Ŀ¼ΪD:\PythonÏîÄ¿\¾®×ÖÆåV1.0

3.randomÄ£¿é

randomÄ£¿éÓÃÓÚÉú³ÉËæ»úÊý£¬ËüÌṩÁ˺ܶຯÊý¡£½ÓÏÂÀ´£¬Õë¶Ô³£¼ûµÄËæ»úÊýº¯Êý½øÐн²½â£¬¾ßÌåÈçÏ¡£

£¨1£©random.random()

·µ»Ø0Óë1Ö®¼äµÄËæ»ú¸¡µãÊýN£¬·¶Î§Îª0 <= N < 1.0¡£

½ÓÏÂÀ´£¬Í¨¹ýÒ»¸ö°¸ÀýÀ´ÑÝʾrandom()µÄʹÓ㬾ßÌå´úÂëÈçÏÂËùʾ£º

import random
# Éú³ÉµÚ1¸öËæ»úÊý
print("random():", random.random())
# Éú³ÉµÚ2¸öËæ»úÊý
print("random():", random.random())

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PythonµÄ±ê׼ģ¿é£ºsys¡¢os¡¢randomºÍtime

ͼ2ÔËÐнá¹û

£¨3£©random.randint(a,b)

·µ»ØÒ»¸öËæ»úµÄÕûÊýN£¬NµÄȡֵ·¶Î§Îªa <= N <= b¡£ÐèҪעÒâµÄÊÇ£¬aºÍbµÄȡֵ±ØÐëΪÕûÊý£¬²¢ÇÒaµÄÖµÒ»¶¨ÒªÐ¡ÓÚbµÄÖµ£¬Ê¾Àý´úÂëÈçÏ£º

import random
# Éú³ÉµÄËæ»úÊýΪN£¬NµÄȡֵ·¶Î§Îª12 <= N <= 20
print(random.randint(12, 20))
# Éú³ÉµÄËæ»úÊýΪN£¬NµÄ½á¹ûÓÀÔ¶ÊÇ20
print(random.randint(20, 20))
# print(random.randint(20, 10))  # ¸ÃÓï¾äÊÇ´íÎóµÄ£¬ÏÂÏÞ£¨a£©±ØÐëСÓÚÉÏÏÞ£¨b£©¡£

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PythonµÄ±ê׼ģ¿é£ºsys¡¢os¡¢randomºÍtime

ͼ3 ÔËÐнá¹û

£¨4£©random.randrange([start], stop[, step])

·µ»ØÖ¸¶¨µÝÔö»ùÊý¼¯ºÏÖеÄÒ»¸öËæ»úÊý£¬»ùÊýĬÈÏֵΪ1¡£ÆäÖУ¬start²ÎÊýÓÃÓÚÖ¸¶¨·¶Î§ÄڵĿªÊ¼Öµ£¬Æä°üº¬ÔÚ·¶Î§ÄÚ£»end²ÎÊýÓÃÓÚÖ¸¶¨·¶Î§ÄڵĽáÊøÖµ£¬Æä²»°üº¬ÔÚ·¶Î§ÄÚ£»step±íʾµÝÔö»ùÊý¡£

ÉÏÊöÕâЩ²ÎÊý±ØÐëΪÕûÊý¡£ÀýÈ磬random.randrange (10, 100, 2)Ï൱ÓÚ´Ó[10, 12, 14, 16, … 96, 98]ÐòÁÐÖлñȡһ¸öËæ»úÊý¡£

£¨5£©random.choice(sequence)

´ÓsequenceÖзµ»ØÒ»¸öËæ»úµÄÔªËØ¡£ÆäÖУ¬sequence²ÎÊý¿ÉÒÔÊÇÁбí¡¢Ôª×é»ò×Ö·û´®¡£Ê¾Àý´úÂëÈçÏ£º

random.choice("ѧϰPython")
random.choice(["JGood","is", "a","handsome", "boy"])
random.choice(("Tuple","List", "Dict"))

ÐèҪעÒâµÄÊÇ£¬ÈôsequenceΪ¿Õ£¬Ôò»áÒý·¢IndexErrorÒì³£¡£

£¨6£©random.shuffle (x[,random])

ÓÃÓÚ½«ÁбíÖеÄÔªËØ´òÂÒ˳Ðò£¬Ë׳ÆÎªÏ´ÅÆ¡£Ê¾Àý´úÂëÈçÏ£º

demo_list = ["Python", "is", "powerful", "simple", "and so on..."] 
random.shuffle(demo_list) 
print(demo_list) 
# ---- ½á¹û£¨²»Í¬»úÆ÷ÉϵĽá¹û¿ÉÄܲ»Ò»Ñù¡££© 
# ['powerful', 'simple', 'is', 'Python', 'and so on...']

£¨7£©random.sample(sequence,k)

´ÓÖ¸¶¨ÐòÁÐÖÐËæ»ú»ñÈ¡k¸öÔªËØ×÷Ϊһ¸öƬ¶Î·µ»Ø£¬sampleº¯Êý²»»áÐÞ¸ÄÔ­ÓÐÐòÁС£Ê¾Àý´úÂëÈçÏ£º

list_num = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
slice = random.sample(list_num, 5) # ´Ólist_numÖÐËæ»ú»ñÈ¡5¸öÔªËØ£¬×÷Ϊһ¸öƬ¶Ï·µ»Ø 
print(slice) 
print(list_num) # Ô­ÓÐÐòÁв¢Ã»Óиıä¡£

4.timeÄ£¿é

timeÄ£¿éÖÐÌṩÁËһϵÁд¦Àíʱ¼äµÄº¯Êý£¬³£Óú¯ÊýµÄ˵Ã÷Èç±í3Ëùʾ¡£

±í3 timeÄ£¿éµÄ³£Óú¯Êý

º¯Êý ˵Ã÷
time.time() »ñÈ¡µ±Ç°Ê±¼ä£¬½á¹ûΪʵÊý£¬µ¥Î»ÎªÃë
time.sleep(secs) ½øÈëÐÝÃß̬£¬Ê±³¤ÓɲÎÊýsecsÖ¸¶¨£¬µ¥Î»ÎªÃë
time.strptime(string[,format]) ½«Ò»¸öʱ¼ä¸ñʽ£¨È磺2019-02-25£©µÄ×Ö·û´®½âÎöΪʱ¼äÔª×é
time.localtime([secs]) ÒÔstruct_timeÀàÐÍÊä³ö±¾µØÊ±¼ä
time.asctime([tuple]) »ñȡʱ¼ä×Ö·û´®£¬»ò½«Ê±¼äÔª×éת»»Îª×Ö·û´®
time.mktime(tuple) ½«Ê±¼äÔª×éת»»ÎªÃëÊý
strftime(format[, tuple]) ·µ»Ø×Ö·û´®±íʾµÄµ±µØÊ±¼ä£¬¸ñʽÓÉformat¾ö¶¨                                   
ÏÂÃæÍ¨¹ýһЩʾÀýÀ´ÑÝʾtimeÄ£¿éÖв¿·Öº¯ÊýµÄÓ÷¨¡£

£¨1£©time()º¯Êý

ͨ¹ýtime()º¯Êý»ñÈ¡µ±Ç°µÄʱ¼ä£¬ÀûÓôËÌØÐÔ¼ÆËã³ÌÐòµÄÖ´ÐÐʱ¼ä£¬Ê¾Àý´úÂëÈçÏ¡£

import time
before = time.time()
# ¼ÆËã1000µÄ10000´Î·½
result = pow(1000, 10000)
after = time.time()
interval = after - before
print(f"ÔËÐÐʱ¼äΪ{interval}Ãë")

ÉÏÊö´úÂëÊ×Ïȵ¼ÈëÁËtimeÄ£¿é£¬Ê¹ÓÃtime()º¯Êý»ñÈ¡Á˵±Ç°µÄʱ¼ä£¬È»ºóʹÓÃpow()º¯Êý¼ÆËã1000µÄ10000´Î·½£¬ÔÚ¼ÆËã¸Ã½á¹ûʱ»á²úÉúÒ»¶¨µÄ¼ÆËãʱ¼ä£¬¼ÆËã½áÊøºóÔÙ´ÎʹÓÃtime()º¯Êý»ñÈ¡µ±Ç°µÄʱ¼ä£¬×îºó¼ÆËãÁ½¸öʱ¼äµÄ²îÖµ£¬ÒԵõ½³ÌÐòÖ´ÐеÄʱ¼ä¡£

ÔËÐдúÂ룬½á¹ûÈçÏÂËùʾ¡£

ÔËÐÐʱ¼äΪ0.0009999275207519531Ãë

£¨2£©sleep()º¯Êý

Èç¹ûÔÚ¿ª·¢¹ý³ÌÖÐÐèÒª¶Ôij¸ö¹¦ÄÜ»òij¶Î´úÂëÉèÖÃÖ´ÐÐʱ¼ä¼ä¸ô£¬ÄÇô¿ÉÒÔͨ¹ýsleep()º¯ÊýʵÏÖ¡£sleep()º¯Êý»áÈóÌÐò½øÈëÐÝÃߣ¬²¢¿É×ÔÓÉÉ趨ÐÝÃßʱ¼ä¡£

½ÓÏÂÀ´£¬Í¨¹ýÒ»¸öʾÀýÀ´ÑÝʾsleep()º¯ÊýµÄÓ÷¨£¬¾ßÌå´úÂëÈçÏ¡£

import random, time
name_li1 = ["Àî·É", "ÕÅÓð", "ÕÔΤ", "ÍõÖÒ", "¶Å³¬"]
name_li2 = []
for i in range(len(name_li1)):    # ÉèÖÃÑ­»·´ÎÊý
    people = random.choice(name_li1) # Ëæ»úÑ¡ÔñÒ»¸öÔªËØ
    name_li1.remove(people)       # Ϊ±ÜÃâ³öÏÖÖØ¸´ÔªËØ£¬ÒƳýÒÑÑ¡ÔñÔªËØ
    name_li2.append(people)       # Ìí¼Óµ½name_li2ÁбíÖÐ
    time.sleep(2)             # ÿ¸ô2sÖ´ÐÐÒ»´Î
    print(f"´ËʱµÄ³ÉÔ±ÓÐ{name_li2}")

ÉÏÊö´úÂëÊ×Ïȵ¼ÈëÁËrandomÄ£¿éÓëtimeÄ£¿é£¬È»ºó¶¨ÒåÁËÁ½¸öÁбíname_li1Óëname_li2£¬ ±éÀúÁбíname_li1£¬µ÷ÓÃchoice()º¯ÊýËæ»úÑ¡ÔñÒ»¸öÔªËØ£¬²¢½«Ëæ»ú»ñÈ¡µÄÔªËØÃ¿¸ô2ÃëÌí¼Óµ½Áбíname_li2ÖУ¬Ö±ÖÁÈ«²¿Ìí¼Ó¡£

ÔËÐдúÂ룬½á¹ûÈçÏÂËùʾ¡£

´ËʱµÄ³ÉÔ±ÓÐ['ÕÅÓð']
´ËʱµÄ³ÉÔ±ÓÐ['ÕÅÓð', 'ÕÔΤ']
´ËʱµÄ³ÉÔ±ÓÐ['ÕÅÓð', 'ÕÔΤ', '¶Å³¬']
´ËʱµÄ³ÉÔ±ÓÐ['ÕÅÓð', 'ÕÔΤ', '¶Å³¬', 'ÍõÖÒ']
´ËʱµÄ³ÉÔ±ÓÐ['ÕÅÓð', 'ÕÔΤ', '¶Å³¬', 'ÍõÖÒ', 'Àî·É']

£¨3£©strptime()º¯ÊýÓëmktime()º¯Êý

Èç¹ûÔÚ¿ª·¢³ÌÐòµÄ¹ý³ÌÖÐÐèÒª×Ô¶¨Òåʱ¼ä´Á£¬ÄÇôtimeÄ£¿éµÄstrptime()º¯ÊýÓëmktime()º¯ÊýÊÇ×îºÃµÄÑ¡Ôñ£¬Ê¹ÓÃËüÃÇ¿ÉÒÔ¿ìËÙÉú³Éʱ¼ä´Á£¬¾ßÌå´úÂëÈçÏ¡£

import time
str_dt = "2019-02-25 17:43:54"
# ת»»³Éʱ¼äÊý×é
time_struct = time.strptime(str_dt, "%Y-%m-%d %H:%M:%S")
# ת»»³Éʱ¼ä´Á
timestamp = time.mktime(time_struct)
print(timestamp)

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1551087834.0

£¨4£©strftime()º¯Êý

strftime()º¯ÊýÀ´¸ñʽ»¯ÈÕÆÚ£¬Æä¶¨Òå¸ñʽÈçÏ£º

time.strftime(format[, t])

½ÓÏÂÀ´£¬Í¨¹ýÒ»¸ö°¸ÀýÀ´ÑÝʾstrftime()º¯ÊýµÄʹÓ㬾ßÌå´úÂëÈçÏÂËùʾ£º

import time
# ¸ñʽ»¯³É2016-03-20 11:45:39ÐÎʽ
print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
# ¸ñʽ»¯³ÉSat Mar 28 22:24:24 2016ÐÎʽ
print(time.strftime("%a %b %d %H:%M:%S %Y", time.localtime()))
# ½«¸ñʽ×Ö·û´®×ª»»ÎªÊ±¼ä´Á
time_word = "Sat Mar 28 22:24:24 2016"
print(time.mktime(time.strptime(time_word, "%a %b %d %H:%M:%S %Y")))

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PythonµÄ±ê׼ģ¿é£ºsys¡¢os¡¢randomºÍtime

5.calendarÄ£¿é

calendarÄ£¿éÓкܹ㷺µÄ·½·¨ÓÃÀ´´¦ÀíÄêÀúºÍÔÂÀú£¬Èç´òӡijÔµÄÔÂÀú£¬¾ßÌå´úÂëÈçÏÂËùʾ£º

import calendar
calendar_january = calendar.month(2016, 1)
print("ÒÔÏÂÊä³ö2016Äê3Ô·ݵÄÈÕÀú:")
print(calendar_january)

ÔËÐдúÂ룬½á¹ûÈçͼ5Ëùʾ¡£

PythonµÄ±ê׼ģ¿é£ºsys¡¢os¡¢randomºÍtime

ͼ5ÔËÐнá¹û

³ý´ËÖ®Í⣬calendarÄ£¿é»¹ÌṩÁ˺ܶàÄÚÖú¯Êý£¬¾ßÌåÈç±í4Ëùʾ¡£

±í4 calendarÄ£¿éµÄ³£¼ûº¯Êý

ÐòºÅ º¯ÊýºÍ˵Ã÷
1 calendar.calendar(year,w=2,l=1,c=6) ·µ»ØÒ»¸ö¶àÐÐ×Ö·û´®¸ñʽµÄyearÄêÄêÀú£¬Èý¸öÔÂÒ»ÐУ¬¼ä¸ô¾àÀëΪc¡£ ÿÈÕ¿í¶È¼ä¸ôΪw×Ö·û¡£Ã¿Ð㤶ÈΪ21* w+18+2* c¡£lÊÇÿÐÇÆÚÐÐÊý
2 calendar.firstweekday( ) ·µ»Øµ±Ç°Ã¿ÖÜÆðʼÈÕÆÚµÄÉèÖá£Ä¬ÈÏÇé¿öÏ£¬Ê×´ÎÔØÈëcalendarÄ£¿éʱ·µ»Ø0£¬¼´ÐÇÆÚÒ»
3 calendar.isleap(year) ÊÇÈòÄê·µ»ØTrue£¬·ñÔòΪFalse
4 calendar.leapdays(y1,y2) ·µ»ØÔÚy1£¬y2Á½ÄêÖ®¼äµÄÈòÄê×ÜÊý
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