test: use f-strings in interface_*.py tests

1 files changed, 10 insertions, 10 deletions

diff --git a/test/functional/interface_http.py b/test/functional/interface_http.py
index d007490f80..075224c011 100755
--- a/test/functional/interface_http.py
+++ b/test/functional/interface_http.py
@@ -24,8 +24,8 @@ class HTTPBasicsTest (BitcoinTestFramework):
         # lowlevel check for http persistent connection #
         #################################################
         url = urllib.parse.urlparse(self.nodes[0].url)
-        authpair = url.username + ':' + url.password
-        headers = {"Authorization": "Basic " + str_to_b64str(authpair)}
+        authpair = f'{url.username}:{url.password}'
+        headers = {"Authorization": f"Basic {str_to_b64str(authpair)}"}
 
         conn = http.client.HTTPConnection(url.hostname, url.port)
         conn.connect()
@@ -42,7 +42,7 @@ class HTTPBasicsTest (BitcoinTestFramework):
         conn.close()
 
         #same should be if we add keep-alive because this should be the std. behaviour
-        headers = {"Authorization": "Basic " + str_to_b64str(authpair), "Connection": "keep-alive"}
+        headers = {"Authorization": f"Basic {str_to_b64str(authpair)}", "Connection": "keep-alive"}
 
         conn = http.client.HTTPConnection(url.hostname, url.port)
         conn.connect()
@@ -59,7 +59,7 @@ class HTTPBasicsTest (BitcoinTestFramework):
         conn.close()
 
         #now do the same with "Connection: close"
-        headers = {"Authorization": "Basic " + str_to_b64str(authpair), "Connection":"close"}
+        headers = {"Authorization": f"Basic {str_to_b64str(authpair)}", "Connection":"close"}
 
         conn = http.client.HTTPConnection(url.hostname, url.port)
         conn.connect()
@@ -70,8 +70,8 @@ class HTTPBasicsTest (BitcoinTestFramework):
 
         #node1 (2nd node) is running with disabled keep-alive option
         urlNode1 = urllib.parse.urlparse(self.nodes[1].url)
-        authpair = urlNode1.username + ':' + urlNode1.password
-        headers = {"Authorization": "Basic " + str_to_b64str(authpair)}
+        authpair = f'{urlNode1.username}:{urlNode1.password}'
+        headers = {"Authorization": f"Basic {str_to_b64str(authpair)}"}
 
         conn = http.client.HTTPConnection(urlNode1.hostname, urlNode1.port)
         conn.connect()
@@ -81,8 +81,8 @@ class HTTPBasicsTest (BitcoinTestFramework):
 
         #node2 (third node) is running with standard keep-alive parameters which means keep-alive is on
         urlNode2 = urllib.parse.urlparse(self.nodes[2].url)
-        authpair = urlNode2.username + ':' + urlNode2.password
-        headers = {"Authorization": "Basic " + str_to_b64str(authpair)}
+        authpair = f'{urlNode2.username}:{urlNode2.password}'
+        headers = {"Authorization": f"Basic {str_to_b64str(authpair)}"}
 
         conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
         conn.connect()
@@ -94,13 +94,13 @@ class HTTPBasicsTest (BitcoinTestFramework):
         # Check excessive request size
         conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
         conn.connect()
-        conn.request('GET', '/' + ('x'*1000), '', headers)
+        conn.request('GET', f'/{"x"*1000}', '', headers)
         out1 = conn.getresponse()
         assert_equal(out1.status, http.client.NOT_FOUND)
 
         conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
         conn.connect()
-        conn.request('GET', '/' + ('x'*10000), '', headers)
+        conn.request('GET', f'/{"x"*10000}', '', headers)
         out1 = conn.getresponse()
         assert_equal(out1.status, http.client.BAD_REQUEST)