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-rw-r--r--paramiko/_winapi.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/paramiko/_winapi.py b/paramiko/_winapi.py
index ab2a71e6..96284b69 100644
--- a/paramiko/_winapi.py
+++ b/paramiko/_winapi.py
@@ -172,7 +172,7 @@ class MemoryMap(object):
assert isinstance(msg, bytes)
n = len(msg)
if self.pos + n >= self.length: # A little safety.
- raise ValueError("Refusing to write %d bytes" % n)
+ raise ValueError(f"Refusing to write {n} bytes")
dest = self.view + self.pos
length = ctypes.c_size_t(n)
ctypes.windll.kernel32.RtlMoveMemory(dest, msg, length)