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-rw-r--r--gerber/utils.py9
1 files changed, 7 insertions, 2 deletions
diff --git a/gerber/utils.py b/gerber/utils.py
index 56b675f..0f0c07c 100644
--- a/gerber/utils.py
+++ b/gerber/utils.py
@@ -201,9 +201,14 @@ def detect_file_format(filename):
File format. either 'excellon' or 'rs274x'
"""
- # Read the first 20 lines
+ # Read the first 20 lines (if possible)
+ lines = []
with open(filename, 'r') as f:
- lines = [next(f) for x in xrange(20)]
+ try:
+ for i in range(20):
+ lines.append(f.readline())
+ except StopIteration:
+ pass
# Look for
for line in lines: