ValueError: unsupported format character 'w' (0x77) at index 650
Question
This is my first post in stackoverflow and hopefully I get an answer for my question. I am trying to print on an html page a string sent from a python code, but when I return the string on the html page it shows me this error: "ValueError: unsupported format character 'w' (0x77) at index 650". This is the python code:
def doctor_post(self, name, userID, password, telegramID):
resp=open("response.html").read()
new = {
"name": name,
"userID": userID,
"password": password,
"telegramID": telegramID,
"patientsList": []
}
r = requests.post(self.Catalog+"/doctor", json=new)
if r.status_code==200:
out=resp % "Registered"
return out
While the html:
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Response</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<p> </p>
<p> </p>
<h1 style="text-align: center;"> Response</h1>
<p> </p>
<p> </p>
<!--The string specified in the python script after % will go instead of %s-->
<h3 style="text-align: center;">%s</h3>
<p> </p>
<p> </p>
<p style="text-align: center;"><input type="button" onclick="document.location.href='/';" value="Homepage"><br></p>
</body>
</html>
2 answers
solution1
1 ACCPTED 2022-05-15 21:35:17
Personally for something like this I rather use "replace":
- in the html, instead of
%sI would use something like___RESPONSE_VALUE___ - in the python code
out = resp.replace("___RESPONSE_VALUE___", "Registered")
For more complex items, I suggest you to check Jinja2 library, it is excellent for templating
solution2
0 2022-05-15 22:46:24
The problem here is that you have a % w in your html file.
The "%" operator in python search for all % character in the string and do some replacement based on what's next.
To keep the "%s" as the placeholder value, replace all litteral % by %% .
As other mentioned, it's better to use something else than "%s" for the placeholder, like ___RESPONSE_VALUE___ , {{ RESPONSE_VALUE }} or using a templating system like jinja .
PS: Python also has the str.format function that's more advanced than "%" :
print("Hello {} !".format("You"))
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