I would like to count different universities from which the mail was sent for which i used the following code:
fname = raw_input('Enter the file name: ')
try:
fhan = open(fname)
except:
print 'File cannot be opened:', fname
count = 0
sum = 0
for i in fhan:
if i.startswith('From'):
x=i.find('#')
y=i.find(' ',x)
str1=i[x+1:y].strip()
print str1
count=count+1
print count
The final output gives me the handles but can i remove the repeated ones, if i print uct.ac.za it shouldnot print and count again
link for file: www.py4inf.com/code/mbox-short.txt
You can append the handles in a list instead of printing it. And then convert that list in a set. In a set there are no repeated elements so you will get the a set of unique universities. And Finally, you can iterate through the set and print the universities.
For count you can use the len function that will count the universities in the set.
This is the modified code:-
fname = raw_input('Enter the file name: ')
try:
fhan = open(fname)
except:
print 'File cannot be opened:', fname
universities = []
for i in fhan:
if i.startswith('From'):
x=i.find('#')
y=i.find(' ',x)
str1=i[x+1:y].strip()
universities.append(str1)
universities = set(universities)
for i in universities:
print i
print len(universities)
Related
I am new with python. I am trying to rstrip space, split and append the list into words and than sort by alphabetical order. I don’t what I am doing wrong.
fname = input("Enter file name: ")
fh = open(fname)
lst = list(fh)
for line in lst:
line = line.rstrip()
y = line.split()
i = lst.append()
k = y.sort()
print y
I have been able to fix my code and the expected result output.
This is what I was hoping to code:
name = input('Enter file: ')
handle = open(name, 'r')
wordlist = list()
for line in handle:
words = line.split()
for word in words:
if word in wordlist: continue
wordlist.append(word)
wordlist.sort()
print(wordlist)
If you are using python 2.7, I believe you need to use raw_input() in Python 3.X is correct to use input(). Also, you are not using correctly append(), Append is a method used for lists.
fname = raw_input("Enter filename: ") # Stores the filename given by the user input
fh = open(fname,"r") # Here we are adding 'r' as the file is opened as read mode
lines = fh.readlines() # This will create a list of the lines from the file
# Sort the lines alphabetically
lines.sort()
# Rstrip each line of the lines liss
y = [l.rstrip() for l in lines]
# Print out the result
print y
I am working in the textwrap module that requires the outputted text to look like see picture of expected output formatting
However, my output looks like:
see my output
This is the code I am using for the text wrap:
wrap = textwrap.TextWrapper(initial_indent = ' '*4, subsequent_indent = ' '*4)
if name not in bus_name:
print 'This business is not found'
else:
count = 0
for id in bus_name[name]:
if id not in bus_review:
print 'No reviews for this business are found'
else:
for rev in bus_review[id]:
print 'Review %d' %(count+1)
string = textwrap.fill(rev)
string = string.replace(' ', '$')
string = wrap.fill(string)
string = string.replace('$', '\n'+' '*4)
print '%s' %string
print
count += 1
I am stuck on an exercise from a Coursera Python course, this is the question:
"Open the file mbox-short.txt and read it line by line. When you find a line that starts with 'From ' like the following line:
From stephen.marquard#uct.ac.za Sat Jan 5 09:14:16 2008
You will parse the From line using split() and print out the second word in the line (i.e. the entire address of the person who sent the message). Then print out a count at the end.
Hint: make sure not to include the lines that start with 'From:'.
You can download the sample data at http://www.pythonlearn.com/code/mbox-short.txt"
Here is my code:
fname = raw_input("Enter file name: ")
if len(fname) < 1 : fname = "mbox-short.txt"
fh = open(fname)
count = 0
for line in fh:
words = line.split()
if len(words) > 2 and words[0] == 'From':
print words[1]
count = count + 1
else:
continue
print "There were", count, "lines in the file with From as the first word"`
The output should be a list of emails and the sum of them, but it doesn't work and I don't know why: actually the output is "There were 0 lines in the file with From as the first word"
I used your code and downloaded the file from the link. And I am getting this output:
There were 27 lines in the file with From as the first word
Have you checked if you are downloading the file in the same location as the code file.
fname = input("Enter file name: ")
counter = 0
fh = open(fname)
for line in fh :
line = line.rstrip()
if not line.startswith('From '): continue
words = line.split()
print (words[1])
counter +=1
print ("There were", counter, "lines in the file with From as the first word")
fname = input("Enter file name: ")
fh = open(fname)
count = 0
for line in fh :
if line.startswith('From '): # consider the lines which start from the word "From "
y=line.split() # we split the line into words and store it in a list
print(y[1]) # print the word present at index 1
count=count+1 # increment the count variable
print("There were", count, "lines in the file with From as the first word")
I have written all the comments if anyone faces any difficulty, in case you need help feel free to contact me. This is the easiest code available on internet. Hope you benefit from my answer
fname = input('Enter the file name:')
fh = open(fname)
count = 0
for line in fh:
if line.startswith('From'):
linesplit =line.split()
print(linesplit[1])
count = count +1
fname = input("Enter file name: ")
if len(fname) < 1 : fname = "mbox-short.txt"
fh = open(fname)
count = 0
for i in fh:
i=i.rstrip()
if not i.startswith('From '): continue
word=i.split()
count=count+1
print(word[1])
print("There were", count, "lines in the file with From as the first word")
fname = input("Enter file name: ")
if len(fname) < 1 : fname = "mbox-short.txt"
fh = open(fname)
count = 0
for line in fh:
if line.startswith('From'):
line=line.rstrip()
lt=line.split()
if len(lt)==2:
print(lt[1])
count=count+1
print("There were", count, "lines in the file with From as the first word")
My code looks like this and works as a charm:
fname = input("Enter file name: ")
if len(fname) < 1:
fname = "mbox-short.txt"
fh = open(fname)
count = 0 #initialize the counter to 0 for the start
for line in fh: #iterate the document line by line
words = line.split() #split the lines in words
if not len(words) < 2 and words[0] == "From": #check for lines starting with "From" and if the line is longer than 2 positions
print(words[1]) #print the words on position 1 from the list
count += 1 # count
else:
continue
print("There were", count, "lines in the file with From as the first word")
It is a nice exercise from the course of Dr. Chuck
There is also another way. You can store the found words in a separate empty list and then print out the lenght of the list. It will deliver the same result.
My tested code as follows:
fname = input("Enter file name: ")
if len(fname) < 1:
fname = "mbox-short.txt"
fh = open(fname)
newl = list()
for line in fh:
words = line.split()
if not len(words) < 2 and words[0] == 'From':
newl.append(words[1])
else:
continue
print(*newl, sep = "\n")
print("There were", len(newl), "lines in the file with From as the first word")
I did pass the exercise with it as well. Enjoy and keep the good work. Python is so much fun to me even though i always hated programming.
I am required to count the frequency of the key words from a text file. I am not allowed to use dictionaries or sets, and I also cannot import any Python methods. I honestly cannot figure out how to do it!!
This is how its supposed to display:
car 4
dog 4
egg 3
here's what i have so far, and it absolutely does not work.
fname = input("enter file name:")
ifile = open(fname, 'r')
list1 = ['car', 'dog', 'cat'.....'ect']
list2 = []
for word in ifile:
if word in list1:
list2.index(word)[1] += 1
else:
list2.append([word,])
print(list2,)
I played with this a little... I noticed I had to enter file name in quotes for some reason.
fname = input('enter file name:')
ifile = open(fname, 'r')
list1 = []
list2 = []
for line in ifile.readlines():
for word in line.split(' '):
word = word.strip()
if word in list1:
list2[list1.index(word)] += 1
else:
list1.append(word)
list2.append(1)
for item in list1:
print item, list2[list1.index(item)]
Given you can't use any set/list structures why not use another string and write the unique words encountered, incrementing on existence. Pseudocode:
create empty string for storage
parse and extract words
iterate
check word against string (if exists: increment / ifnot exists: add and set count to 1)
output string
I have been using multiple code snippets to create a solution that will allow me to write a list of players in a football team to a csv file.
import csv
data = []
string = input("Team Name: ")
fName = string.replace(' ', '') + ".csv"
print("When you have entered all the players, press enter.")
# while loop that will continue allowing entering of players
done = False
while not done:
a = input("Name of player: ")
if a == "":
done = True
else:
string += a + ','
string += input("Age: ") + ','
string += input("Position: ")
print (string)
file = open(fName, 'w')
output = csv.writer(file)
for row in string:
tempRow = row
output.writerow(tempRow)
file.close()
print("Team written to file.")
I would like the exported csv file to look like this:
player1,25,striker
player2,27,midfielder
and so on. However, when I check the exported csv file it looks more like this:
p
l
a
y
e
r
,
2
5
and so on.
Does anyone have an idea of where i'm going wrong?
Many thanks
Karl
Your string is a single string. It is not a list of strings. You are expecting it to be a list of strings when you are doing this:
for row in string:
When you iterate over a string, you are iterating over its characters. Which is why you are seeing a character per line.
Declare a list of strings. And append every string to it like this:
done = False
strings_list = []
while not done:
string = ""
a = input("Name of player: ")
if a == "":
done = True
else:
string += a + ','
string += input("Age: ") + ','
string += input("Position: ") + '\n'
strings_list.append(string)
Now iterate over this strings_list and print to the output file. Since you are putting the delimiter (comma) yourself in the string, you do not need a csv writer.
a_file = open(fName, 'w')
for row in strings_list:
print(row)
a_file.write(row)
a_file.close()
Note:
string is a name of a standard module in Python. It is wise not to use this as a name of any variable in your program. Same goes for your variable file