How to get rid of a character from a password

[Fuugie]

I made a random password generator for a project and it works fine, but when it generates passwords, it always adds " { " to a password or two. Why does it add this and how do I fix it?

import os
import random
from Tkinter import *
from tkMessageBox import *
 
class Application(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.grid()
        self._passwordLength = StringVar()
        self._passwordLength.set("")
        self._passwordAmount = StringVar()   # create a String control variable
        self._passwordAmount.set("")
        self._fileName = StringVar()
        self._fileName.set("")
        top = self.winfo_toplevel()  # find top-level window
        top.title("Random Password Generator")
        self._createWidgets()
 
    def _createWidgets(self):
        siteLabel = Label(self, text="Password Lengths Wanted:", anchor = E, width = 20)
        siteLabel.grid(row = 0, column = 0)
        siteLabel = Label(self, text="Password Amount Wanted:", anchor = E, width = 20)
        siteLabel.grid(row = 1, column = 0)
        siteLabel = Label(self, text="File Name:", anchor = E, width = 20)
        siteLabel.grid(row = 2, column = 0)
        lengthEntry = Entry(self, takefocus = 1,
                          textvariable = self._passwordLength)
        lengthEntry.grid(row = 0, column = 1, sticky=E+W)
        amountEntry = Entry(self, takefocus = 1,
                          textvariable = self._passwordAmount)
        amountEntry.grid(row = 1, column = 1, sticky=E+W)
        fileEntry = Entry(self, takefocus = 1,
                          textvariable = self._fileName)
        fileEntry.grid(row = 2, column = 1, sticky=E+W)
        self._button = Button(self, text = "Generate", command = self._getData, width = 20)
        self._button.grid(row = 3, column = 0)
        self._button = Button(self, text = "Quit", command = self._quitProgram, width = 20)
        self._button.grid(row = 3, column = 1)
 
    def _getData(self):
        try:
            passwordLength = int(self._passwordLength.get())
            passwordAmount = int(self._passwordAmount.get())
        except:
            showwarning("Error","Please check you input.")
        self._generatePasswords(passwordLength, passwordAmount)
 
    def _generatePasswords(self, passwordLength, passwordAmount):
        fileName = str(self._fileName.get())
        if ".txt" not in fileName:
            fileName += ".txt"
        if os.path.isfile(fileName):
            if askyesno("Verify", "This file already exists, would you like to overwrite it?"):
                fileToWrite = open(fileName, "w")
        else:
            fileToWrite = open(fileName, "w")
        try:
            randomize(passwordLength, passwordAmount, fileToWrite)
            if True:
                showwarning("Random Password Generator", "Passwords Created! Check your folder!")
        except:
            showwarning("Error"," Please check your input.")
 
    def _quitProgram(self):
        if askyesno('Verify', 'Are you sure you would like to quit the program?'):
            root.destroy()
 
# end class Application
 
def main():
    Application().mainloop()
 
def randomize(length, amount, fileToWrite):
    for num in xrange(amount):
        newPassword = ""
        for count in xrange(length):
            randomInt = random.randint(0,26)
            newPassword += chr(randomInt+97)
            count += 1
        fileToWrite.write(newPassword+"\n")
    fileToWrite.close()
 
root = Tk()
main()
 

[gershwyn]

In ASCII, the { character follows immediately after lowercase z. When you're generating a random number, you're asking for a value between 0 and 26 inclusive, which gives you 27 possibilities total.

Try changing line 78 to

randomInt = random.randint(0, 25)

and see where that gets you.

[Fuugie]

Worked like a charm. Thank you! :]

Also, if it isn't too much to ask. How would I format this:

try:
            randomize(passwordLength, passwordAmount, fileToWrite)
            if True:
                showwarning("Random Password Generator", "Passwords Created! Check your folder!")
 

So it would say "Passwords Created! Check your folder for (file name)!"

[bvdet]

showwarning("Random Password Generator", "Passwords Created! Check your folder for %s!" % fileToWrite)

Randomly generated passwords are often made from a combination of digits, upper case letters and lower case letters.

>>> import string
>>> import random
>>> passwordLen = 8
>>> seq = string.digits+string.ascii_letters
>>> "".join([random.choice(seq) for i in range(passwordLen)])
'v5JuKQoT'
>>> 

[dwblas]

You can use a loop to create the 3 labels if you want.

        for ctr, lit in enumerate(["Password Lengths Wanted:", "Password Amount Wanted:", "File Name:"]):
            siteLabel = Label(self, text=lit, anchor = E, width = 20)
            siteLabel.grid(row = ctr, column = 0) 

Also, you have 2 separate varaibles named "count". The second one does nothing here and can be deleted.

def randomize(length, amount, fileToWrite):
    for num in xrange(amount):
        newPassword = ""
        for count in xrange(length):
            randomInt = random.randint(0,26)
            newPassword += chr(randomInt+97)
            ## this does nothing so it can be deleted            
            count += 1 

[Fuugie]

Thanks bvdet! Your answers are always short, sweet and get right to the point!
How would I implement your code to making the password more random?

[bvdet]

Sorry it took so long to respond.

I would rewite function randomize as follows:

import string, random
 
def randomize(length, amount, fileToWrite):
    seq = string.digits+string.ascii_letters
    fileToWrite.write("\n".join(["".join([random.choice(seq) \
                                          for i in range(length)]) \
                                              for i in xrange(amount)]))
    fileToWrite.close()

Note that writing to the file once is much faster than writing to the file for each password. The same thing holds true for print.

[Fuugie]

Thanks again for the help bvdet! It worked out great!