Question

Hi everyone im doing a little assignment in python and I need to do the following thing:
i have directories like /home/user/music, /home/user/photos and the like witch are inserted by the user and each new folder is a level so what i need to do is to create a method that recieves a number and then prints every folder that is at that level.

So far I have the creation of the list but i don’t know how i can count every single “/” in the strings that are added via keyboard and have them stored so i can know the levels and then compare them with the number the program recieves.

If anybody can give me at least some basic idea of where to start I will be very greatful. Thanks in advance

I want to do something like this (pseudo-code)

example of some strings:
/home/user/music
/home/user/photos
/home/user/research
/home/user/music/rock

n=raw_input
if n is equal to a specific amount of "/":
print "every string that has the same amount of "/"

FULL CODE SO FAR

print "Please add paths"
l1=raw_input("> ")
l2=raw_input("> ")
while True:
        if l2 == "//":
            break
        else:
            l1=l1+"\n"
            l1=l1+l2
            l2=raw_input("> ")
l1=l1.split("\n")
print "Your paths are"
print "\n"
print "\n" .join(l1)
print "\n"
print l1[1].count("/")

while True:
    print "Choose an option "
    print "1. Amount of sub folders of a path"
    print "2. Amount of folders at a specified level"
    print "3. Max depth between all the folders"
    op=raw_input()
    if op == "1":
        print "Ingrese directorio"
        d=raw_input()
    if op == "2":
        print "Ingrese nivel"
        n=raw_input()
        compararnivel(n)

raw_input()

Answer 1

If you are sure that the user enters the entire path name, and there are no relative paths etc., you can simply use str.count as follows:

>>> str.count('/home/usr/music', '/')
3

If however you do need to manipulate the paths to first get them into the full path format, and/or do path validation, take a look at the functions provided in os.path

Ok, so here is some code explaining my comments:

1. You can add the raw_input data to a list instead of joining it to a string and splitting it up as follows:

   l1 = [] # This makes an empty list
   l2 = raw_input("> ") # Do this statement in a loop if you like
   l1.append(l2) # This appends l2 to the list
   

2. The while loop can be better expressed as follows:

   while l2!='//':
     append l2 to the list
     prompt the user for more input
   

3. You should add an end condition to your 2nd while loop, perhaps by adding a 4th prompt asking the user to quit

Putting all this together, you get the following (Note my comments, they should help you)

print "Please add paths, enter // to stop" # It is a good idea to tell the user how to stop the input process

l1 = [] # Create empty list
l2 = raw_input('> ') # Ideally, you should verify that the user entered a valid path (eg: are '/' allowed at the end of a path?)

while l2 != '//':
    l1.append(l2)
    l2 = raw_input('> ')

print "Your paths are: "
for path in l1:
    print path

# I am not sure what you are trying to achieve with "print l1[1].count("/")" so leaving it out

# I would suggest to print the options outside the loop, it's a matter of taste, 
# but do you really want to keep printing them out?
print "Choose an option: \n\
       1. Number of subfolders of path\n\
       2. Number of folders at a specific path\n\
       3. Max depth between all folders\n\
       4. Quit\n"

choice = raw_input('Enter choice: ')

while choice!='4':
    if choice == '1':
        path = raw_input('Which path are you looking for?')
            # Calculate and print the output here

    # This is the question you asked, so I am answering how to process this step    
    if choice == '2':
        level = raw_input('Which level? ') # Ideally, you should verify that the user indeed enters an int here

        # Since your python does not seem to be very advanced, let's use a simple for loop:
        num=0
        for path in l1:
            if str.count(path, '/')==int(level):
                num = num+1

        print 'Number of such paths is: ', num

    if choice == '3':
        print 'this is not yet implemented'
        # Do something

    choice = raw_input('Enter choice: ')