File "test.py", line 9, in <module> print(c.__hour) AttributeError: 'Clock' object has no attribute '__hour' 私有属性只能通过类内的方法来访问,这就是所谓“封装”。不光是有私有属性,我们同样也可以定义私有方法,定义的方式跟私有属性相同: class Clock: def __init__(self): self.__hour...
import random import string import cache def random_string(length): s = '' for i in range(length): s = s + random.choice(string.ascii_letters) return s cache.init() for n in range(1000): while True: key = random_string(20) if cache.contains(key): continue else: break value = ...
If so, an error is returned and the file is not downloaded. """ file_name = os.path.basename(filename) if filetype == FILE_TYPE_SOFTWARE: if len((file_name)) > FELMNAMME_127 or len(file_name) < FELMNAMME_4: logging.error('%s too long or too short, please check!',file_name...
print('Anexceptionflewby!') 代码语言:txt AI代码解释 raise 输出异常信息如下: 代码语言:txt AI代码解释 Anexceptionflewby! 代码语言:txt AI代码解释 Traceback(mostrecentcalllast): 代码语言:txt AI代码解释 File"<stdin>",line2,in? 代码语言:txt AI代码解释 NameError:HiThere 如果一个异常在try子句里...
'nat' means to return a NaT (not-a-time) for an invalid day. 'forward' and 'following' mean to take the first valid day later in time. 'forward'的含义是使当前日期变为向前取第一个有效的工作日,如果在这个上面加上offsets,以改变后得日期为基础计算日期,计算第几个工作日 ...
When Usain Bolt ran 100 meters in 9.58 seconds at the 2009 world championships, he had an average speed of 10.4 meters per second. This translates to about 37.6 kilometers per hour and 23.4 miles per hour. Validating JSON You’ll now look at one last use case. Take a quick look at th...
("Hour")for hand in Second, Minute, Hour:hand.shapesize(1, 1, 3)hand.speed(0)Watch = Turtle()Watch.hideturtle()Watch.penup()def Skip(step):penup()forward(step)pendown()def Create(name, length):reset()Skip(-length * 0.1)begin_poly()forward(length * 1.1)end_poly()handForm = get...
str.count(sub) 返回字串sub在str中出现的次数 “an apple a day”.count(“a”) 结果为 4 str.replace(old,new) 返回字符串str副本,所有old字串被替换为new “python”.replace(“n”,“”) 结果为 “pytho” str.center(width [,fillchar] ) 字符串str根据宽度width居中,fillchar可选 “python”.cen...
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time.gmtime(time.time())#time.struct_time(tm_year=2016, tm_mon=10, tm_mday=26, tm_hour=8, tm_min=45, tm_sec=8, tm_wday=2, tm_yday=300, tm_isdst=0)#format_time to struct_time time.strptime('2011-05-05 16:37:06','%Y-%m-%d %X')#time.struct_time(tm_year=2011, tm_...