b_date_time = datetime.datetime(b_date[0],b_date[1],b_date[2]) e_date = end_date.split("-") e_date = [int(num) for num in e_date] e_date_time = datetime.datetime(e_date[0],e_date[1],e_date[2]) days = (e_date_tim
时间是特殊的数值类型，它将结合datetime模块讲解。还有两个常见的数据类型，布尔值和空值。布尔值是逻辑...
模块,可是Python自带的、而外安装的或者开发者自己写的,在一个文件里使用模块很简单用import即可,import有点像C语言的include。以Python2的内建模块datetime为例,讲解一下模块的基本使用。在新程序里使用datetime模块可以有两种方式:方式一是把模块引入,而模块里的函数的使用需要用点运算的方式来来使用。import datetime...
dateutil - Extensions to the standard Python datetime module. pendulum - Python datetimes made easy. pytz - World timezone definitions, modern and historical. Brings the tz database into Python. Debugging Tools Libraries for debugging code. pdb-like Debugger ipdb - IPython-enabled pdb. pudb -...
>>>importos>>>dir(os)<returns a list of allmodulefunctions>>>help(os)<returns an extensive manual page createdfromthemodule's docstrings> 针对日常的文件和目录管理任务,:mod:shutil 模块提供了一个易于使用的高级接口: >>>importshutil>>>shutil.copyfile('data.db','archive.db')>>>shutil.move...
Python中也内置了很多模块,常用的有math、datetime、os等等。 例如,利用datetime获取当前年月: #导入日期模块 import datetime # 获取当前年、月 def get_year_and_month(): now = datetime.datetime.now() year=now.year month=now.month return year,month year,month=get_year_and_month(); print(f'{year...
While not a purely functional language, Python supports many functional programming concepts, including treating functions as first-class objects. This means that functions can be passed around and used as arguments, just like any other object like str, int, float, list, and so on. Consider the...
mylist=['blue','orange','green']#Map the list into a dict using the map,zip and dict functions mapped_dict=dict(zip(itr,map(fn,itr))) Dictionary Snippets 现在处理的数据类型是字典 №7:合并两个或多个字典 假设我们有两个或多个字典,并且我们希望将它们全部合并为一个具有唯一键的字典 ...
Functions are descriptors. Whenever a function is accessed as an attribute, the descriptor is invoked, creating a method object which "binds" the function with the object owning the attribute. If called, the method calls the function, implicitly passing the bound object as the first argument (...
values_list = ['blue','red','bold'] #有 3 种方法可以将这两个列表转换为字典 # 1.使用Python zip、dict函数 dict_method_1 = dict(zip(keys_list, values_list)) # 2. 使用带有字典推导式的 zip 函数 dict_method_2 = {key:valueforkey, valueinzip(keys_list, values_list)} ...