Python.format（）已添加到url，但抛出一个KeyE

Question

我想向url添加一个带有.format（）的变量，但python抛出了一个KeyError。你知道吗

我得到的错误是：

KeyError: '"page"'

我在url中添加了.format（）和{}，请参见下面的url。在url.format（）的末尾添加。你知道吗

url with .format() / {"page":{}}'.format(valuetest)
url = 'https://nl.soccerway.com/a/block_competition_matches_summary?block_id=page_competition_1_block_competition_matches_summary_5&callback_params={"page":"-1","block_service_id":"competition_summary_block_competitionmatchessummary","round_id":"50855","outgroup":"","view":"2","competition_id":"34"}&action=changePage&params={"page":{}}'.format(valuetest)

original url:
url = 'https://nl.soccerway.com/a/block_competition_matches_summary?block_id=page_competition_1_block_competition_matches_summary_5&callback_params={"page":"-1","block_service_id":"competition_summary_block_competitionmatchessummary","round_id":"50855","outgroup":"","view":"2","competition_id":"34"}&action=changePage&params={"page":1}'

下面是一个简单的例子：

valuetest = '1'
urltest = 'https://www.testing.com{}'.format(valuetest)
print(urltest)

结果：https://www.testing.com1

如何创建url以便向url添加变量？你知道吗

Answer 1

您需要转义任何不属于替换字段的大括号。你知道吗

url = 'https://nl.soccerway.com/a/block_competition_matches_summary?block_id=page_competition_1_block_competition_matches_summary_5&callback_params={{"page":"-1","block_service_id":"competition_summary_block_competitionmatchessummary","round_id":"50855","outgroup":"","view":"2","competition_id":"34"}}&action=changePage&params={{"page":{}}}'

---

https://docs.python.org/3/library/string.html#format-string-syntax

Answer 2

如果要打印文字大括号并使用格式，则必须将它们加倍。你知道吗

所以它应该是params={{"page":{}}}，而不是params={"page":{}}。与callback_params相同。你知道吗