This program will print the last traded price of the company whose symbol is given to the program as command-line arguments like:
$ python sharevalue.py GOOG YHOO ...
A link to the source code.
$ python sharevalue.py GOOG YHOO GOOG YHOO 920.24 27.04
In the main function, take command-line arguments and construct url string.
n_argc = len(sys.argv) if n_argc < 2: print 'please specify symbol and try again.' print 'e.g. sharevalue.py GOOG YHOO ...' return 1 #print n_argc l_symbol = [] l_symbol = [ sys.argv[n] for n in range(1, n_argc) ] #print l_symbol # s_symbol = 's=GOOG&s=YHOO&...' s_symbol = "" s_symbol = '&'.join( [ 's=' + l_symbol[n] for n in range(n_argc - 1) ] ) #print s_symbol s_url = "" s_url = 'http://download.finance.yahoo.com/d/quotes.csv?' + \ s_symbol + \ '&f=l1' #print s_url
Retrieve data from the URL and store them into a list.
try: f = urllib2.urlopen(s_url) except urllib2.URLError: print 'failed to open url', s_url else: l_quote = [] l_quote = f.readlines() # e.g. ['920.24\r\n', '27.04\r\n'] f.close() #print l_quote
Format strings and output.
print "%s".ljust(6) % '\t'.join(l_symbol) l_quote = [ s.strip() for s in l_quote ] print "%6s" % '\t'.join(l_quote)
Write a program to print the latest share value of a company whose NASDAQ symbol would be provided in the command line.
#!/usr/bin/env python
import urllib2
import sys
# a function share_price is defined to get the latest share value of a company
def share_price(nasdaqsym):
#the link to the finance site is made abd the data is stored in the instance "share_value"
share_value = urllib2.urlopen('http://download.finance.yahoo.com/d/quotes.csv?s='+nasdaqsym+'&f=l1')
#The share price is printed
print "Latest share price of company with NASDAQ symbol "+nasdaqsym+" : " +share_value.read()
if __name__ == '__main__':
#Checking included whether we have one Symbol in the command line or not as per the syntax "./sharevalue .py [NASDAQ symbol]
if len(sys.argv) == 2:
share_price(sys.argv[1])
else:
print "Give only one NASDAQ symbol at a time after command line argument!"
sys.exit(0)
For the above stated problem, to obtain the latest share value of a company using the company's NASDAQ symbol, the function urlopen() of the module urllib2 has been used. It takes the link of the website finance.yahoo.com as input and returns the latest share value(specified by the sybmol f=l1 in the link) of the company which is stored in the instance share_value. Then in '__main__', a checking is included which checks whether there is only one input symbol given after the command line input i.e ./sharevalue.py.
The Link to the original code is given in sharevalue.py.
#!/usr/bin/env python import urllib2 import sys # a series of command line checks for sanity # check to make sure an arg is given for the ticker symbol if len(sys.argv) < 2: print "Come on dude, I need a ticker symbol to look up" print "For example, $ ./sharevalue GOOG" print "Try it again." sys.exit(1) # check to make sure only one symbol is given elif len(sys.argv) > 2: print "Please just give me one ticker symbol to look up" print "For example, $ ./sharevalue GOOG" print "Try it again." sys.exit(1) # set ticker symbol argv[1] to variable s for easier usage s = sys.argv[1] # check to see if arg is alphanumeric if s.isalnum() == False: print "Oh come on man! this isn't that hard" print "For example, $ ./sharevalue GOOG" print "It must be alphanumeric, try again." sys.exit(1) # check to see if arg is less that 5 characters elif len(s) > 4: print "Don't you know?" print "A ticker symbol is not more than 4 characters in length." print "For example, $ ./sharevalue GOOG" sys.exit(1) # pass the ticker symbol to the url string ticker_name = ('http://download.finance.yahoo.com/d/quotes.csv?s=%s&f=l1' % sys.argv[1]) # go get the stock quote and cast the returned data to a string and float get_quote = urllib2.urlopen(ticker_name) q = get_quote.read() float(q) # determine if it was an actual quote if float(q) < 0.001: print "Whoa, either that is a real dog of stock," print "or you still need to enter a vaild ticker symbol." print "To see the quote for Google try $ ./sharevalue goog" sys.exit(1) # display the quote else: print q
My solution to the "mount" home task is very simple.
The ouput is the same as the mount command, because it does exactly the same thing, but does it from a python script.
The link to my code can be found here .
This program will print the current share price of the company whose NASDAQ value is given to the program as an argument like:
./sharevalue.py [NASDAQ symbol]
#!/usr/bin/env python
import urllib2
import sys
def main(nasdaq):
"""
Here all work is being done.
:arg nasdaq: NASDAQ symbol
"""
#making the link in 'link' string to fetch data'
link = 'http://download.finance.yahoo.com/d/quotes.csv?s='+nasdaq+'&f=l1'
print 'Fetching data from: '+link
#data saved into an instance share_value
share_value = urllib2.urlopen(link)
#Printing share_value
print 'Current share price of company '+nasdaq+': '+share_value.read()
if __name__=='__main__':
if len(sys.argv) == 2:
main(sys.argv[1])
else:
print "Syntax: ./sharevalue.py [NASDAQ Symbol]"
sys.exit(0)
Run the above script like:
$ ./sharevalue.py [NASDAQ value]
or:
$ python sharevalue.py [NASDAQ value]
Here some example output is given below:
$ ./sharevalue.py ORCL Fetching data from: http://download.finance.yahoo.com/d/quotes.csv?s=ORCL&f=l1 Current share price of company ORCL: 31.9449 $ ./sharevalue.py GOOG Fetching data from: http://download.finance.yahoo.com/d/quotes.csv?s=GOOG&f=l1 Current share price of company GOOG: 919.27 $./sharevalue.py GOOG ORCL Syntax: ./sharevalue.py [NASDAQ Symbol]
Task Write a file mount.py which when executed as ./mount.py gives the same output as mount command. For this we require to read /proc/mounts.
Basically we first open and read the mounts file in the proc directory which inturn is present in the root directory.This is done using s=open("/proc/mounts") command followed by f=s.read() . By default the file content is not the same as output obtained by giving mount command on the CLI. So we need to assign the file contents to a variable and then manupulate it using basic python commands so as to achieve the desired output.
The contents of the file which is read by a variable is first split into individual lines using f.split("n"). Each line is split into list of words using z[i].split(" "). Each list of words is then manupulated using insert() method , to insert words in the list, replace() method, to replace words or parts of words in the list, del() method, to delete words from the list and append(), method to add words to the end of the list. Lastly we use join() method to join all the words in the list to form lines which is then printed as output. The /proc/mounts file is closed at the end.
link to the code ` link <https://github.com/elitalobo/HomeTask1/tree/master/mount>`_
Solution
The code is all about printing the contents of the mount command.
At 1st we open the file /proc/mounts and then make changes so that the output comes out to be the contents of the mount command. Then we read the file line by line by the function readline(). then looping through each line we insert and delete certain elements as is given in the code below.
Code
#!/usr/bin/env python
f = open("/proc/mounts")#opens the file /proc/mounts
l = f.readlines()# reads the file line by line
for i in l[1:]:# for loop which ignores the first line of the file
a = i.split(" ")#splits the file line by line according to spaces
del a[-2]#deletes the second last zero from the file
del a[-1]#deletes the last zero from the file
a.insert(2,"type ")# the string "type" is inserted in index 2
a.insert(1,"on")# the string "on" is inserted in index 1
a.insert(5,"(")# the opening bracket "(" is inserted in the 5th index
a.insert(7,")")# the closing bracket ")" is inserted in the 7th index
str = " ".join(a)# the splitted string is joined using the join() functi on
print str #the required output is printed; for loop ends
f.close()# file is closed
Link
The link to the code is:
https://github.com/Bidisha2git/Training_tasks_dgplug/blob/master/mount.py
Code in python to print the exact output as received on carrying out the 'mount' command.
1.)In the program, we are initially using the open() function, to open the "/proc/mounts" file. 2.)And then, we are using a for loop to split the lines of the file one by one and then carry out the required manipulations in the file in order to get the exact output as one would have received on carrying out the mount command. 3.)Further, join() function is used to join the split strings and finally, printing the required output as desired. 5.)Lastly, we use the close() function to close the edited file.
Link to the actual code file is: '<https://github.com/Devyani-Divs/Home-tasks_dgplug/blob/master/mount.py>'
The code written below gives the same output as that given by the mount command on the terminal. The code first opens a file named mounts present in /proc directory,then reads its contents line by line and then prints the contents(required output)after carrying functions such as strip,insert, delete etc.then we closes this file to prevent the program from crashing.
1.#!/usr/bin/env python 2.f = open("/proc/mounts") #this opens the mounts file present inside p roc directory 3. b= f.readlines() #reads the text inside the mounts file.
3.for x in b[1:]: 4. l = x.split(" ") 5. del l[-2] 6. del l[-1] 7. l.insert(2,"type ") 8. l.insert(1,"on") 9. l.insert(5,"(") 10. l.insert(7,")") 11. str = " ".join(l) 12.print str 13.f.close() #closes the file after use.
The link of the code is: https://github.com/resham/summer-training-hometask/blob/master/mount.py
Problem- Generate a program in python which will produce the same output as the mount command.
Description
The file is opened in read mode using f = open("/proc/mounts"). The default mode is read.
Each line of the file is read For each line a function call is made to function func The function func is responsible for converting the string which is passed to it into a list. The last two elements of the list are deleted. Then on,type,( and ) are added to the list. The list is then converted into string and printed on the console.
After the operation is complete file is closed.
Click the link below to see the program
- Execute the program using following command
$ chmod +x mount.py
$ ./mount.py