(iv) Time and import of 4-4 python

The Import import statement acts as a means of importing a module, which can appear anywhere in the program. Shortcut keys are ALT + ENTER to import modules directly

1. If the file is imported locally, you can use it directly: import filename
2, if the import is a package, the package can be imported under the __init__.py, otherwise it will error, as long as there is a __init.py file, the Python parser will take this directory as a package
2 commonly used formats
A, from ... import ... What is imported from what module, and what can eventually be imported is a function, class, and module
B, import ...
Summary: one-layer call
Note: What is imported after import, what must be written at the time of the call.
Use from import, can not write suffix name when importing
For example:
The directory structure is as follows:

d:.│  Model.py│└─zhan        test.py        test.pyc        __init__. py        __init__  . pyctest.pydef  Hello ():    print("Hello World"  ") model.py#  import  zhan.test#  Zhan.test.hello ()fromimport  Hellohello ()

Operation Result:

Hello World

DateTime acquisition Time

The DateTime module defines the following classes:
Datetime.date: A class that represents a date. The commonly used attributes are year, month and day;
Datetime.time: A class that represents time. The commonly used properties are hour, minute, second, microsecond;
Datetime.datetime: Represents the DateTime.
Datetime.timedelta: Represents the time interval, which is the length between two points in time.
Datetime.tzinfo: Related information about the time zone.
Note: These types of objects above are immutable (immutable).
For example:

 fromDatetimeImportDatetimenow_time=DateTime.Now ()Print(now_time) new_time= Now_time.strftime ("%y-%m-%d%h:%m:%s")Print(new_time) Now1= Now_time.strftime ("%c")Print(now1) yesterday_time= Now_time + Timedelta (days=-1)Print(yesterday_time) tomorrow_time= Now_time + Timedelta (days=+1,minutes=+100)Print(Tomorrow_time.strftime ("%y-%m-%d%h:%m:%s"))

Operation Result:

2017-11-08 22:47:56.0250002017-11-08 22:47:5611/08/17 22:47:562017-11-07 23:04:05.7380002017-11-10 00:44:05

Note: 1, first import the DateTime class
2. Get the time required by the now method of the DateTime
3, DateTime more usage, can be viewed through the Dir method
4, Now_time or a DateTime class, converted to a string by the Strftime method, the strftime parameter is the form that needs to convert the string
5. Common parameters of Strftime
%Y decimal year with century part
%m Decimal Month
The day ordinal of a month in%d decimal notation
%H 24 Hours of production
%m Decimal Minutes
%s decimal seconds
%c standard Time, such as: 11/08/17 22:47:56

Time
Time-Exclusive usage:
Import time
For I in Xrange (1,10):
Print (i)
Time.sleep (1)
Execution Result:
1
2

Note: The program outputs a result every 1 seconds

Conversion of time formats to each other

 fromDatetimeImportDatetimenow_time=DateTime.Now ()Print(now_time)Print(Type (now_time))Print("*****time to STR * * * * *") _time= Now_time.strftime ("%y-%m-%d%h:%m:%s")Print(_time)Print(Type (_time))Print("*****STR to TIME * * * * *") _d_time= Datetime.strptime (_time,"%y-%m-%d%h:%m:%s")Print(_d_time)Print(Type (_d_time))

Operation Result:

' Datetime.datetime ' ' Str ' ' Datetime.datetime '>

Timestamp to Time object

 from Import datetime Import TimeNow   = time.time ()print= Datetime.fromtimestamp (now)print(now_ Time)print(Type (now_time))

Operation Result:

' Datetime.datetime '>

(iv) Time and import of 4-4 python