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⚡️ Speed up function xfp2str by 14% #59

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⚡️ Speed up function xfp2str by 14% #59

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3 changes: 2 additions & 1 deletion electrum/plugins/coldcard/coldcard.py
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Original file line number Diff line number Diff line change
Expand Up @@ -646,6 +646,7 @@ def xfp_int_from_xfp_bytes(fp_bytes: bytes) -> int:
def xfp2str(xfp: int) -> str:
# Standardized way to show an xpub's fingerprint... it's a 4-byte string
# and not really an integer. Used to show as '0x%08x' but that's wrong endian.
return struct.pack('<I', xfp).hex().lower()
# Optimization: avoid .lower() call by formatting hex directly to lowercase.
return struct.pack('<I', xfp).hex()

# EOF