[英]How to delete the last line of my output file?
一直在尝试编写我的 PYTHON 代码,但它总是 output 文件末尾有一个空行。 有没有办法修改我的代码,这样它就不会打印出最后一个空行。
def write_concordance(self, filename):
""" Write the concordance entries to the output file(filename)
See sample output files for format."""
try:
file_out = open(filename, "w")
except FileNotFoundError:
raise FileNotFoundError("File Not Found")
word_lst = self.concordance_table.get_all_keys() #gets a list of all the words
word_lst.sort() #orders it
for i in word_lst:
ln_num = self.concordance_table.get_value(i) #line number list
ln_str = "" #string that will be written to file
for c in ln_num:
ln_str += " " + str(c) #loads line numbers as a string
file_out.write(i + ":" + ln_str + "\n")
file_out.close()
这张图片中的Output_file第 13 行是我需要的
检查以便不为列表的最后一个元素添加新行:
def write_concordance(self, filename):
""" Write the concordance entries to the output file(filename)
See sample output files for format."""
try:
file_out = open(filename, "w")
except FileNotFoundError:
raise FileNotFoundError("File Not Found")
word_lst = self.concordance_table.get_all_keys() #gets a list of all the words
word_lst.sort() #orders it
for i in word_lst:
ln_num = self.concordance_table.get_value(i) #line number list
ln_str = "" #string that will be written to file
for c in ln_num:
ln_str += " " + str(c) #loads line numbers as a string
file_out.write(i + ":" + ln_str)
if i != word_lst[-1]:
file_out.write("\n")
file_out.close()
问题在这里:
file_out.write(i + ":" + ln_str + "\n")
\n
添加一个新行。
解决这个问题的方法是稍微重写它:
ln_strs = []
for i in word_lst:
ln_num = self.concordance_table.get_value(i) #line number list
ln_str = " ".join(ln_num) #string that will be written to file
ln_strs.append(f"{i} : {ln_str}")
file_out.write('\n'.join(ln_strs))
顺便说一句,你实际上不应该使用file_out = open()
和file_out.close()
而是with open() as file_out:
,这样你总是关闭文件并且异常不会让文件挂起
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