Python根据指定格式生成句子

先上运行效果：

源代码：

import random
import sys

two_chars_words = ["朱砂","天下","杀伐","人家","韶华","风华","繁华","血染","墨染","白衣",
                   "素衣","嫁衣","倾城","孤城","空城","旧城","旧人","伊人","心疼","春风",
                   "古琴","无情","迷离","奈何","断弦","焚尽","散乱","陌路","乱世","笑靥",
                   "浅笑","明眸","轻叹","烟火","一生","三生","浮生","桃花","梨花","落花",
                   "烟花","离殇","情殇","爱殇","剑殇","灼伤","仓皇","匆忙","陌上","清商",
                   "焚香","墨香","微凉","断肠","痴狂","凄凉","黄梁","未央","成双","无恙",
                   "虚妄","凝霜","洛阳","长安","江南","忘川","千年","纸伞","烟雨","回眸",
                   "公子","红尘","红颜","红衣","红豆","红线","青丝","青史","青冢","白发",
                   "白首","白骨","黄土","黄泉","碧落","紫陌","如花","相思","沧笙","亘古",
                   "殷红","揉碎","年少","烟火","泪痕","红颜","踏歌","梦醒","美人","戏子"]
four_chars_words = ["情深缘浅","情深不寿","莫失莫忘","阴阳相隔","如花美眷","似水流年","眉目如画",
                    "曲终人散","繁华落尽","不诉离殇","一世长安","百媚千红","情之所钟","阴晴圆缺",
                    "悲欢离合","此去经年","天涯海角","相濡以沫","静水流深","悠悠琴声","秋锁寒烟"]
sentence_model = ["xx，xx，xx了xx。",
                  "xxxx，xxxx，不过是一场xxxx。",
                  "你说xxxx，我说xxxx，最后不过xxxx。",
                  "xx，xx，许我一场xxxx。",
                  "一x一x一xx，半x半x半xx。",
                  "你说xxxxxxxx，后来xxxxxxxx。",
                  "xxxx，xxxx，终不敌xxxx。",
                  "为君沦xx，乱舞在xx。",
                  "用我xxxx，换你xxxx。",
                  "我自是xx，xxxx。",
                  "终是谁使xx，xxxx，xxxx。",
                  "多少xx，多少xx，唯留xxxx。",
                  "任他xxxx，为你一笑xxxx。",
                  "谁将xxxx，散了xxxx。",
                  "xxxx，xxxx。三生xxxx，一朝xxxx。",
                  "风华是xxxx，苍老是xxxx。",
                  "几段唏嘘xxxx，可笑我命xxxx。",
                  "xx，xx，我终于看见xxxx，那是xxxx。",
                  "谁应了谁的xx，又变成了谁的xx。"]

def get_sentence():
    model = random.choice(sentence_model)
    #print(model)
    while (model.count("xxxx")!=0):
        model=model.replace("xxxx",random.choice(four_chars_words),1)
    while (model.count("xx")!=0):
        model=model.replace("xx",random.choice(two_chars_words),1)
    while (model.count("x")!=0):
        model=model.replace("x",random.choice(two_chars_words),1)
    return model

with open('demo.txt','w',encoding="utf-8") as f:
    for i in range(50):
        f.write(get_sentence()+"\n")
print("Done!")