[Tutor] Python 3.4.1 question for Mac users

[Richard Dillon]

I’m teaching myself Python 3.4.1 on a Mac and the book I’m using is written for 
Windows users.

I’m trying to open a file on the desktop and I created a path using the  
example in the book.

 

Any Mac users out there with a solution? My main drive is named “OS”.

Here’s my code:


  

def main():

my_file = input('Enter file to open: ')

infile = open(r'\OS\Users\richarddillon\Desktop\my_file','r')

file_contents = infile.read()

infile.close()

print(file.contents)

 

main()___
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[Tutor] reading strings and calculating totals

[Richard Dillon]

I apologize in advance - This is my third week using Python (3.4.1 on a Mac)

I need to read a text file, convert the values into numbers and calculate a 
total.
The total I get doesn't match the values entered in the file.

def main():
total = 0
infile = open('/Users/richarddillon/Desktop/numbers.txt', 'r') 
# read first record
line = infile.readline()
a = float(line)
# read rest of records
while line != '':
total = total + a
line = infile.readline()
infile.close()
print(total)

main()
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Re: [Tutor] reading strings and calculating totals

[Richard Dillon]

When I tried

total = 0
with open('/Users/richarddillon/Desktop/numbers.txt', 'r') as infile:
   for line in infile:
   total += float(line)
print(total)

Python returned "ValueError: could not convert string to float: "

Richard

On Aug 30, 2014, at 1:13 PM, Alan Gauld  wrote:

> total = 0
> with open('/Users/richarddillon/Desktop/numbers.txt', 'r') as infile:
>for line in infile:
>total += float(line)
> print(total)

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[Tutor] This is driving my crazy! My file hasn't been corrupted

[Richard Dillon]

My text file has five numbers, 1-5
I don't what the problem is.
I've written the file using Word (saved as .txt ) as well as TextEdit
Python 3.4.1 on a Mac

Here's the code:

#   Richard Dillon

#   This program reads data from a .txt file and calculates a total
#   data in text file: 1,2,3,4 and 5 for a total of 15
#   error message: Non-numeric data found in the file

def main():


total = 0.0

try:

infile = open('/Users/richarddillon/Desktop/numbers.txt', 'r')

for line in infile:
amount = float(line)
total += amount

infile.close()

print(format(total, ',.2f'))

except IOError:
print('An error occured trying to read the file.')

except ValueError:
print('Non-numeric data found in the file.')

except:
print('An error occured.')

main()
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[Tutor] format command help

[Richard Dillon]

I create column headings using \t

 print('base1\tbase2\theight\tarea')

and I would like the numbers to align with the headings. I think that I need to 
use format instead of doing this:

print(A,' ',B,' ',C,' ',int(area1))
print(D,' ',E,' ',F,' ',int(area2))

but I don't know how.
I've looked at code examples and I can't figure out how.

Thanks 


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