python随机数据生成器应为str实例，找到numpy.datetime64

Hello一直在尝试将带有随机日期的随机数据创建到csv文件中，但出现以下错误

expected str instance，找到numpy.datetime64

数据生成器代码

import pandas as pd
import numpy as np
import string
import random

def gen_random_email():
    domains = [ "hotmail.com", "gmail.com", "aol.com", "mail.com" , "mail.kz", "yahoo.com"]
    letters = string.ascii_letters +'.'*5
    
    email = ''.join(np.random.choice(list(letters),10))+'@'+ np.random.choice(domains)
    email = email.replace('.@', '@')
    return email, "Email"

def gen_random_float():
    num = np.random.random()*np.random.randint(2000)
    
    decimal_points = np.random.randint(8)
    num = int(num*10**(decimal_points))/10**decimal_points
    
    return str(num), 'Float'

def gen_random_sentence():
    nouns = ["puppy", "car", "rabbit", "girl", "monkey"]
    verbs = ["runs", "hits", "jumps", "drives", "barfs"]
    adv = ["crazily", "dutifully", "foolishly", "merrily", "occasionally"]
    adj = ["adorable.", "clueless.", "dirty.", "odd.", "stupid."]

    random_entry = lambda x: x[random.randrange(len(x))]
    
    random_entry = " ".join([random_entry(nouns), random_entry(verbs), 
                     random_entry(adv), random_entry(adj)])

    return random_entry, 'String'

def gen_random_int():
    num = np.random.randint(1000000)
    
    return str(num), 'Int'

def gen_random_date():
    monthly_days = np.arange(0, 30)
    base_date = np.datetime64('2020-01-01')
    random_date = base_date + np.random.choice(monthly_days)
    return random_date, 'Date'

def gen_dataset(filename, size=5000):
    randomizers = [gen_random_email, gen_random_float, gen_random_int, gen_random_sentence,gen_random_date]
    with open(filename, 'w') as file:
        file.write("Text, Type\n")
        for _ in range(size):
            file.write(",".join(random.choice(randomizers)())+"\n") 

gen_dataset('dataaaa.csv')   
    

---

首先，捕获错误并查看是什么导致了它

def gen_dataset(filename, size=5000):
    randomizers = [gen_random_email, gen_random_float, gen_random_int, gen_random_sentence,gen_random_date]
    with open(filename, 'w') as file:
        file.write("Text, Type\n")
        for _ in range(size):
            f = random.choice(randomizers)
            result = f()
            try:
                file.write(",".join(result)+"\n")
            except TypeError:
                print(result)
                raise

---

然后只需修改

try/except

def gen_dataset(filename, size=5000):
    randomizers = [gen_random_email, gen_random_float, gen_random_int, gen_random_sentence,gen_random_date]
    with open(filename, 'w') as file:
        file.write("Text, Type\n")
        for _ in range(size):
            f = random.choice(randomizers)
            a,b = f()
            try:
                q = ",".join([a,b,"\n"])
            except TypeError:
                a = np.datetime_as_string(a)
                q = ",".join([a,b,"\n"])
            file.write(q)

或者干脆先发制人地将第一项设置为字符串

def gen_dataset(filename, size=5000):
    randomizers = [gen_random_email, gen_random_float, gen_random_int, gen_random_sentence,gen_random_date]
    with open(filename, 'w') as file:
        file.write("Text, Type\n")
        for _ in range(size):
            f = random.choice(randomizers)
            a,b = f()
            q = ",".join([str(a),b,"\n"])
            file.write(q)

---

当发布关于产生异常的代码的问题时，请始终包含完整的回溯-复制并粘贴它，然后将其格式化为代码（选择它并键入

ctrl-k

），您是否有可能将其简化为一个问题？

>>> q = gen_random_date()[0]
>>> q
numpy.datetime64('2020-01-27')
>>> np.datetime_as_string(q)
'2020-01-27'
>>> q.astype(str)
'2020-01-27'
>>>

def gen_dataset(filename, size=5000):
    randomizers = [gen_random_email, gen_random_float, gen_random_int, gen_random_sentence,gen_random_date]
    with open(filename, 'w') as file:
        file.write("Text, Type\n")
        for _ in range(size):
            f = random.choice(randomizers)
            a,b = f()
            try:
                q = ",".join([a,b,"\n"])
            except TypeError:
                a = np.datetime_as_string(a)
                q = ",".join([a,b,"\n"])
            file.write(q)

def gen_dataset(filename, size=5000):
    randomizers = [gen_random_email, gen_random_float, gen_random_int, gen_random_sentence,gen_random_date]
    with open(filename, 'w') as file:
        file.write("Text, Type\n")
        for _ in range(size):
            f = random.choice(randomizers)
            a,b = f()
            q = ",".join([str(a),b,"\n"])
            file.write(q)