@@ -65,7 +65,8 @@ def set_environment(self, name: str, value: str) -> None:
6565 if isinstance (cmd .stderr , list ) and len (cmd .stderr ) == 1
6666 else cmd .stderr
6767 )
68- raise ValueError ("tmux set-environment stderr: %s" % cmd .stderr )
68+ msg = f"tmux set-environment stderr: { cmd .stderr } "
69+ raise ValueError (msg )
6970
7071 def unset_environment (self , name : str ) -> None :
7172 """Unset environment variable ``$ tmux set-environment -u <name>``.
@@ -88,7 +89,8 @@ def unset_environment(self, name: str) -> None:
8889 if isinstance (cmd .stderr , list ) and len (cmd .stderr ) == 1
8990 else cmd .stderr
9091 )
91- raise ValueError ("tmux set-environment stderr: %s" % cmd .stderr )
92+ msg = f"tmux set-environment stderr: { cmd .stderr } "
93+ raise ValueError (msg )
9294
9395 def remove_environment (self , name : str ) -> None :
9496 """Remove environment variable ``$ tmux set-environment -r <name>``.
@@ -111,7 +113,8 @@ def remove_environment(self, name: str) -> None:
111113 if isinstance (cmd .stderr , list ) and len (cmd .stderr ) == 1
112114 else cmd .stderr
113115 )
114- raise ValueError ("tmux set-environment stderr: %s" % cmd .stderr )
116+ msg = f"tmux set-environment stderr: { cmd .stderr } "
117+ raise ValueError (msg )
115118
116119 def show_environment (self ) -> Dict [str , Union [bool , str ]]:
117120 """Show environment ``$ tmux show-environment -t [session]``.
@@ -278,18 +281,21 @@ def get_version() -> LooseVersion:
278281 if proc .stderr :
279282 if proc .stderr [0 ] == "tmux: unknown option -- V" :
280283 if sys .platform .startswith ("openbsd" ): # openbsd has no tmux -V
281- return LooseVersion ("%s-openbsd" % TMUX_MAX_VERSION )
284+ return LooseVersion (f"{ TMUX_MAX_VERSION } -openbsd" )
285+ msg = (
286+ f"libtmux supports tmux { TMUX_MIN_VERSION } and greater. This system"
287+ " is running tmux 1.3 or earlier."
288+ )
282289 raise exc .LibTmuxException (
283- "libtmux supports tmux %s and greater. This system"
284- " is running tmux 1.3 or earlier." % TMUX_MIN_VERSION ,
290+ msg ,
285291 )
286292 raise exc .VersionTooLow (proc .stderr )
287293
288294 version = proc .stdout [0 ].split ("tmux " )[1 ]
289295
290296 # Allow latest tmux HEAD
291297 if version == "master" :
292- return LooseVersion ("%s -master" % TMUX_MAX_VERSION )
298+ return LooseVersion (f" { TMUX_MAX_VERSION } -master" )
293299
294300 version = re .sub (r"[a-z-]" , "" , version )
295301
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