在文件中写入大量数据的最快方法

我试图创建一个随机的真实,整数,字母数字,字母字符串,然后写入文件,直到文件大小达到10MB.

代码如下.

import string
import random
import time
import sys


class Generator():
    def __init__(self):
        self.generate_alphabetical_strings()
        self.generate_integers()
        self.generate_alphanumeric()
        self.generate_real_numbers()

    def generate_alphabetical_strings(self):
        return ''.join(random.choice(string.ascii_lowercase) for i in range(12))

    def generate_integers(self):
        return ''.join(random.choice(string.digits) for i in range(12))

    def generate_alphanumeric(self):
        return ''.join(random.choice(self.generate_alphabetical_strings() +
                                     self.generate_integers()) for i in range(12))

    def _insert_dot(self, string, index):
        return string[:index].__add__('.').__add__(string[index:])


    def generate_real_numbers(self):
        rand_int_string = ''.join(random.choice(self.generate_integers()) for i in range(12))
        return self._insert_dot(rand_int_string, random.randint(0, 11))


from time import process_time
import os

a = Generator()

t = process_time()
inp = open("test.txt", "w")
lt = 10 * 1000 * 1000
count = 0
while count <= lt:
    inp.write(a.generate_alphanumeric())
    count += 39
inp.close()

elapsed_time = process_time() - t
print(elapsed_time)

完成大约需要225.953125秒.我怎样才能提高这个程序的速度？请提供一些代码见解？