Python Road Day5-Common module learning

This section outlines:

1. Module Introduction
2. Time &datetime Module
3. Random
4. Os
5. Sys
6. Shutil
7. JSON & Picle
8. Shelve
9. XML processing
10. YAML processing
11. Configparser
12. Hashlib
13. Subprocess
14. Logging module
15. Re-regular expression

module, which implements a set of code for a function with a mound code.

Like functional programming and process-oriented programming, functional programming accomplishes a function, and other code is used to invoke it, providing reusability of code and coupling between the code. For a complex function, multiple functions may be required to complete (functions can be in different. py files), and the Code collection consisting of N. py files is called a module.

such as: OS is a system-related module; file is a module related to the operation of files

The modules are divided into three types:

• Custom Modules
• Built-in standard module (also known as standard library)
• Open source Module

Reference http://www.cnblogs.com/wupeiqi/articles/4963027.html for the use of custom modules and open source modules

Time & DateTime Module

1#_ *_coding:utf-8_*_2__author__ ='Alex Li'3 4 Import Time5 6 7# Print (Time.clock ()) #返回处理器时间,3. 3 started obsolete, changed to Time.process_time () measurement processor operation time, not including sleep time, unstable, Mac can't be measured8 # Print (time.altzone) #返回与utc时间的时间差, measured in seconds9# Print (Time.asctime ()) #返回时间格式"Fri 11:14:16",Ten # Print (Time.localtime ()) #返回本地时间 the struct time object format One# Print (Time.gmtime (Time.time ()-800000)) #返回utc时间的struc时间对象格式 A  -# Print (Time.asctime (Time.localtime ())) #返回时间格式"Fri 11:14:16", -#print (Time.ctime ()) #返回Fri +  A: -: in  .format, Ibid. the  -  -  - # Date string converted to timestamp +# string_2_struct = Time.strptime ("2016/05/22","%y/%m/%d"#将 Date string into the struct time object format - # Print (string_2_struct) + # # A# Struct_2_stamp =time.mktime (string_2_struct) #将struct时间对象转成时间戳 at # Print (struct_2_stamp) -  -  -  - #将时间戳转为字符串格式 -# Print (Time.gmtime (Time.time ()-86640)) #将utc时间戳转换成struct_time格式 in# Print (Time.strftime ("%y-%m-%d%h:%m:%s", Time.gmtime ())) #将utc struct_time format to the specified string format -  to  +  -  the  * #时间加减 $ Import datetimePanax Notoginseng  -# Print (Datetime.datetime.now ()) #返回 .- ,- +  A: -:03.941925 the#print (Datetime.date.fromtimestamp (Time.time ()) # Timestamp goes directly to date format .- ,- + + # Print (Datetime.datetime.now ()) A# Print (Datetime.datetime.now () + Datetime.timedelta (3)) #当前时间 +3 days the# Print (Datetime.datetime.now () + Datetime.timedelta (-3)) #当前时间-3 days +# Print (Datetime.datetime.now () + Datetime.timedelta (hours=3)) #当前时间 +3 hours -# Print (Datetime.datetime.now () + Datetime.timedelta (minutes= -)) #当前时间 +30 min $  $  - # -# c_time =Datetime.datetime.now () the# Print (C_time.replace (minute=3, hour=2)) #时间替换

View Code

Directive	meaning	Notes
%a	Locale ' s abbreviated weekday name.
%A	Locale ' s full weekday name.
%b	Locale ' s abbreviated month name.
%B	Locale ' s full month name.
%c	Locale ' s appropriate date and time representation.
%d	Day of the month as a decimal number [01,31].
%H	Hour (24-hour clock) as a decimal number [00,23].
%I	Hour (12-hour clock) as a decimal number [01,12].
%j	Day of the year as a decimal number [001,366].
%m	Month as a decimal number [01,12].
%M	Minute as a decimal number [00,59].
%p	Locale ' s equivalent of either AM or PM.	(1)
%S	Second as a decimal number [00,61].	(2)
%U	Week number of the year (Sunday as the first day of the Week) as a decimal number [00,53]. A New year preceding the first Sunday is considered to is in week 0.	(3)
%w	Weekday as a decimal number [0 (Sunday), 6].
%W	Week number of the year (Monday as the first day of the Week) as a decimal number [00,53]. A New year preceding the first Monday is considered to is in week 0.	(3)
%x	Locale ' s appropriate date representation.
%X	Locale ' s appropriate time representation.
%y	Year without century as a decimal number [00,99].
%Y	Year with century as a decimal number.
%z	Time zone offset indicating a positive or negative time difference from utc/gmt of the form +hhmm or-hhmm, where H repres Ents decimal hour digits and M represents decimal minute digits [-23:59, +23:59].
%Z	Time zone name (no characters if no time zone exists).
%%	A literal ‘%‘ character.

Random module

Random number

1234	mport randomprintrandom.random()print random.randint(1,2)printrandom.randrange(1,10)

Generate Random Verification code

12345678910

importrandomcheckcode =‘‘fori inrange(4):    current =random.randrange(0,4)    ifcurrent !=i:        temp =chr(random.randint(65,90))    else:        temp =random.randint(0,9)    checkcode +=str(temp)print checkcode

Python Road Day5-Common module learning