我试图在python 3.7中运行以下代码。我一直得到一个无效的语法错误,不知道为什么,有人能发现我做错了吗?缩进似乎很好,我的“Prints”在正确的括号中我相信但我完全迷失在“if”和“else”语句中。
class pdfPositionHandling:
def parse_obj(self, lt_objs):
# loop over the object list
for obj in lt_objs:
if isinstance(obj, pdfminer.layout.LTTextLine):
print ("%6d, %6d, %s" % (obj.bbox[0], obj.bbox[1], obj.get_text().replace('\n', '_'))
# if it's a textbox, also recurse
if isinstance(obj, pdfminer.layout.LTTextBoxHorizontal):
self.parse_obj(obj._objs)
# if it's a container, recurse
elif isinstance(obj, pdfminer.layout.LTFigure):
self.parse_obj(obj._objs)
def parsepdf(self, filename, startpage, endpage):
# Open a PDF file.
fp = open(filename, 'rb')
# Create a PDF parser object associated with the file object.
parser = PDFParser(fp)
# Create a PDF document object that stores the document structure.
# Password for initialization as 2nd parameter
document = PDFDocument(parser)
# Check if the document allows text extraction. If not, abort.
if not document.is_extractable:
raise PDFTextExtractionNotAllowed
# Create a PDF resource manager object that stores shared resources.
rsrcmgr = PDFResourceManager()
# Create a PDF device object.
device = PDFDevice(rsrcmgr)
# BEGIN LAYOUT ANALYSIS
# Set parameters for analysis.
laparams = LAParams()
# Create a PDF page aggregator object.
device = PDFPageAggregator(rsrcmgr, laparams=laparams)
# Create a PDF interpreter object.
interpreter = PDFPageInterpreter(rsrcmgr, device)
i = 0
# loop over all pages in the document
for page in PDFPage.create_pages(document):
if i >= startpage and i <= endpage:
# read the page into a layout object
interpreter.process_page(page)
layout = device.get_result()
# extract text from this object
self.parse_obj(layout._objs)
i += 1
我收到以下错误:
File "C:/Users/951298/Documents/Python Scripts/PDF Scraping/untitled1.py", line 12
if isinstance(obj, pdfminer.layout.LTTextBoxHorizontal):
^
SyntaxError: invalid syntax
不知道为什么它最后指向结肠?
在第9行,你最后应该输入3个括号,但你只有2个括号。添加另一个括号,它将正常工作。
您忘记将结束括号放在print语句上。这会导致下一行出错,因为解释器在读取括号内的代码时会忽略换行符。事实上,它在第12行引发错误的唯一原因是因为if isinstance(obj, pdfminer.layout.LTTextBoxHorizontal):
不是传递给print的有效参数。
因此,以下代码将在第11行引发错误。
bar = "a"
baz = "a"
def foo(msg, bar="\n"):
print(msg, end=bar)
if bar == baz:
foo("bar is equal to baz",
bar = baz
else: #Throws error here
foo("bar is not equal to baz")
#Not the best example, I know, sorry.
奇怪,不是吗?请务必查看引发错误的行上方的行。它为您提供了上下文和潜在的错误代码。您尤其需要在需要换行终止符的编程语言中观察这些类型的错误。
在第9行,你应该有3个结束括号,但我也注意到你有两个if语句和一个elif语句但没有别的,它们都应该是if语句。希望我帮忙!