Update Lines.py

Solve the problem of spaces in Chinese character concatenation.解决中文字符拼接有空格的问题

pdf2docx/text/Lines.py

@@ -110,7 +110,7 @@ def adjust_last_word(self, delete_end_line_hyphen:bool):
         '''
         punc_ex_hyphen = ''.join(c for c in string.punctuation if c!='-')
         def is_end_of_english_word(c):
-            return c.isalnum() or (c and c in punc_ex_hyphen)
+            return c.encode().isalnum() or (c and c in punc_ex_hyphen)
 
         for i, line in enumerate(self._instances[:-1]):
             # last char in this line
@@ -265,4 +265,4 @@ def tab_position(pos): # tab stop index of given position
 
             # update stop reference position
             if line==self._instances[-1]: break
-            ref = line.bbox[idx1] if line.in_same_row(self._instances[i+1]) else block.bbox[idx0]
+            ref = line.bbox[idx1] if line.in_same_row(self._instances[i+1]) else block.bbox[idx0]