print輸出int，錯誤 ValueError: Exceeds the limit (4300) for integer string conve

woff

print輸出int，錯誤 ValueError: Exceeds the limit (4300) for integer string conversion；use sys.set_int_max

在某次輸出number時，遇到這個問題

ValueError: Exceeds the limit (4300) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit

大概可以翻譯出來：

值錯誤：超出limit(4300)整數字串的轉化，使用sys.set_int_max_str_digits()去增加限制
輸出一下sys.set_int_max_str_digits()的幫助訊息

1. print(help(sys.set_int_max_str_digits))

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幫助內容如下：
Help on built-in function set_int_max_str_digits in module sys:

1. set_int_max_str_digits(maxdigits)

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    Set the maximum string digits limit for non-binary int<->str conversions.


這是一個控制非二進制整數與字串互轉最大數字限制的方法。
可以傳入一個參數數字去控制。
沒有談到這個maxdigits是怎麼控制的，這個文件內容有點坑。

我們印數字時，出現了limit(4300)的錯誤，所以可以推斷，這個數字應該是不可以超過4300個位置大小的。

所以嘗試一下

1. print(10**4300)

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他是報錯的，然而當你嘗試

1. print(10 * 4299)

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這時候，他是正常輸出的

所以maxdigits應該就是這個可以控制輸出數位的一個參數。我們來調整成maxdigits==4400，測試結果。

測試用例1

1. import sys
   
2. sys.set_int_max_str_digits(4400)
   
3. 
   
4. try:
   
5.     print(10**4400)
   
6. except ValueError as e:
   
7.     print('超出限制: ' + str(e))

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測試用例2

1. import sys
   
2. sys.set_int_max_str_digits(4400)
   
3. 
   
4. try:
   
5.     print(10**4399)
   
6. except ValueError as e:
   
7.     print('超出限制: ' + str(e))

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可以發現，測試案例1出現異常，測試案例2正常輸出

1. # 测试用例1输出
   
2. 超出限制: Exceeds the limit (4400) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit
   
3. 
   
4. # 测试用例2输出
   
5. 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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由此，我們可以手動去設定maxdigits去調整這個print輸出前轉換的限制，也有一個方法，可以讓這個不受限制，就是讓maxdigits==0
只需要輸入下面的程式碼：

1. import sys
   
2. sys.set_int_max_str_digits(0)

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