Help with formatting

[hellboy632789]

Hello, I am having a weird formatting error that is making me not able to run my code. I double checked all the indents to make sure they were 4 spaces. The problem is that it is causing me to get an error saying that file_output = open(output_file, "w+") output_file is not defined, which obviously it is. So this must be some sort of formatting error. It also is saying that that line is in __init__ making me think that for some reason init never actually ends.

class SimpleEncryption:
    file_name = "blank"

    def __init__(self, code_file):
        file_name = code_file
        pass

    def encrypt(self, input_file, output_file):
        file = open(input_file, "r")
        file_output = open(output_file, "w+")
        line = file.readline()
        while line:
            line_words = line.split()
            line_len = len(line_words)
            for x in range(0, line_len):
                file_code = open(file_name, "r")
                line_code = file_code.readline()
                check = 0
                while line_code:
                    line_code_words = line_code.split()
                    if line_code_words[0] == line_words[x]:
                        file_output.write(line_code_words[1])
                        file_output.write(" ")
                        check = 1
                    line_code = file_code.readline()
                if check is 0:
                    file_output.write(line_words[x])
                    file_output.write(" ")
                file_code.close()
                file_code = open(file_name, "r")
            line = file.readline()
            file_output.write("\n")
        file.close()
        file_output.close()


        pass

    def decrypt(self, input_file, output_file) :
        file = open(input_file, "r")
        file_output = open(output_file, "w+")
        line = file.readline()
        while line:
            line_words = line.split()
            line_len = len(line_words)
            for x in range(0, line_len):
                file_code = open(file_name, "r")
                line_code = file_code.readline()
                check = 0
                while line_code:
                    line_code_words = line_code.split()
                    if line_code_words[1] == line_words[x]:
                        file_output.write(line_code_words[0])
                        file_output.write(" ")
                        check = 1
                    line_code = file_code.readline()
                if check is 0:
                    file_output.write(line_words[x])
                    file_output.write(" ")
                file_code.close()
                file_code = open(file_name, "r")
            line = file.readline()
            file_output.write("\n")
        file.close()
        file_output.close()
        pass