Difference between revisions of "OPS435 Python Exercise 1"
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| + | [[Category:rchan]] | ||
= Objectives = | = Objectives = | ||
* read a single line from a text file | * read a single line from a text file | ||
| Line 23: | Line 24: | ||
line_in = f.readline() | line_in = f.readline() | ||
print(line_in) | print(line_in) | ||
| + | </pre> | ||
| + | |||
| + | Output of the above python code: | ||
| + | <pre> | ||
| + | rchan pts/9 10.40.91.236 Tue Feb 13 16:53:42 2018 - Tue Feb 13 16:57:02 2018 (00:03) | ||
</pre> | </pre> | ||
= Split a single line into words and store all the words in a list = | = Split a single line into words and store all the words in a list = | ||
Python code to split the line "line_in" into words: | Python code to split the line "line_in" into words: | ||
| − | + | <pre> | |
word_list = line_in.split() # <-- split the line into words using space | word_list = line_in.split() # <-- split the line into words using space | ||
# store all the words as a list to word_list | # store all the words as a list to word_list | ||
print(word_list) # <-- you should see the list of word when this line is executed | print(word_list) # <-- you should see the list of word when this line is executed | ||
| + | </pre> | ||
| + | Output from the above print() function: | ||
| + | <pre> | ||
| + | ['rchan', 'pts/9', '10.40.91.236', 'Tue', 'Feb', '13', '16:53:42', '2018', '-', 'Tue', 'Feb', '13', '16:57:02', '2018', '(00:03)'] | ||
</pre> | </pre> | ||
= selected items from a list to make useful data object= | = selected items from a list to make useful data object= | ||
| + | == login date and logout date == | ||
| + | Login date in YYYYmmmdd format: | ||
| + | <pre> | ||
| + | login_date = word_list[7]+word_list[4]+word_list[5] | ||
| + | print('Login date:',login_date) | ||
| + | </pre> | ||
| + | The output will be: | ||
| + | <pre> | ||
| + | Login date: 2018Feb13 | ||
| + | </pre> | ||
| + | |||
| + | Logout date in YYYYmmdd format: | ||
| + | <pre> | ||
| + | logout_date = word_list[13]+word_list[10]+word_list[11] | ||
| + | print('Logout date:, logout_date) | ||
| + | </pre> | ||
| + | The output will be: | ||
| + | <pre> | ||
| + | Logout date: 2018Feb13 | ||
| + | </pre> | ||
| + | == login time and logout time == | ||
| + | <pre> | ||
| + | login_time = word_list[6] | ||
| + | print('Login time:',login_time) | ||
| + | </pre> | ||
| + | The output will be: | ||
| + | <pre> | ||
| + | Login time: | ||
| + | </pre> | ||
=manipulate data objects: date, time, user name, host IP= | =manipulate data objects: date, time, user name, host IP= | ||
Latest revision as of 06:33, 22 June 2018
Contents
Objectives
- read a single line from a text file
- split a single line into words and store all the words in a list
- combine selected items from a list to make useful data object
- manipulate data objects: date, time, user name, host IP
Read a single line from a text file
- file name: test_data_0
- contents:
[rchan@centos7 ex1]$ cat test_data_0 rchan pts/9 10.40.91.236 Tue Feb 13 16:53:42 2018 - Tue Feb 13 16:57:02 2018 (00:03) asmith pts/2 10.43.115.162 Tue Feb 13 16:19:29 2018 - Tue Feb 13 16:22:00 2018 (00:02) tsliu2 pts/4 10.40.105.130 Tue Feb 13 16:17:21 2018 - Tue Feb 13 16:30:10 2018 (00:12) mshana pts/13 10.40.91.247 Tue Feb 13 16:07:52 2018 - Tue Feb 13 16:45:52 2018 (00:38)
Python Code to read a single line (first line) from a file:
file_name = 'test_data_0' f = open(file_name,'r') line_in = f.readline() print(line_in)
Output of the above python code:
rchan pts/9 10.40.91.236 Tue Feb 13 16:53:42 2018 - Tue Feb 13 16:57:02 2018 (00:03)
Split a single line into words and store all the words in a list
Python code to split the line "line_in" into words:
word_list = line_in.split() # <-- split the line into words using space
# store all the words as a list to word_list
print(word_list) # <-- you should see the list of word when this line is executed
Output from the above print() function:
['rchan', 'pts/9', '10.40.91.236', 'Tue', 'Feb', '13', '16:53:42', '2018', '-', 'Tue', 'Feb', '13', '16:57:02', '2018', '(00:03)']
selected items from a list to make useful data object
login date and logout date
Login date in YYYYmmmdd format:
login_date = word_list[7]+word_list[4]+word_list[5]
print('Login date:',login_date)
The output will be:
Login date: 2018Feb13
Logout date in YYYYmmdd format:
logout_date = word_list[13]+word_list[10]+word_list[11]
print('Logout date:, logout_date)
The output will be:
Logout date: 2018Feb13
login time and logout time
login_time = word_list[6]
print('Login time:',login_time)
The output will be:
Login time:
