[英]f.readline versus f.read print output
I am new to Python (using Python 3.6). 我是Python新手(使用Python 3.6)。 I have a read.txt file containing information about a firm.
我有一个read.txt文件,其中包含有关公司的信息。 The file starts with different report characteristics
该文件以不同的报告特征开头
CONFORMED PERIOD REPORT: 20120928 #this is 1 line
DATE OF REPORT: 20121128 #this is another line
and then starts all the text about the firm..... #lots of lines here
I am trying to extract both dates (['20120928','20121128']) as well as some strings that are in the text (ie if the string exists, then I want a '1'). 我试图提取两个日期(['20120928','20121128'])以及文本中的一些字符串(即如果字符串存在,那么我想要'1')。 Ultimately, I want a vector giving me both dates + the 1s and 0s of different strings, that is, something like: ['20120928','20121128','1','0'].
最终,我想要一个向量给我两个日期+不同字符串的1和0,即:['20120928','20121128','1','0']。 My code is the following:
我的代码如下:
exemptions = [] #vector I want
with open('read.txt', 'r') as f:
line2 = f.read() # read the txt file
for line in f:
if "CONFORMED PERIOD REPORT" in line:
exemptions.append(line.strip('\n').replace("CONFORMED PERIOD REPORT:\t", "")) # add line without stating CONFORMED PERIOD REPORT, just with the date)
elif "DATE OF REPORT" in line:
exemptions.append(line.rstrip('\n').replace("DATE OF REPORT:\t", "")) # idem above
var1 = re.findall("string1", line2, re.I) # find string1 in line2, case-insensitive
if len(var1) > 0: # if the string appears, it will have length>0
exemptions.append('1')
else:
exemptions.append('0')
var2 = re.findall("string2", line2, re.I)
if len(var2) > 0:
exemptions.append('1')
else:
exemptions.append('0')
print(exemptions)
If I run this code, I obtain ['1','0'], omitting the dates and giving correct reads of the file, var1 exists (ok '1') and var2 does not (ok '0'). 如果我运行此代码,我获得['1','0'],省略日期并给出正确的文件读取,var1存在(ok'1')而var2不存在(ok'0')。 What I don't understand is why it doesn't report the dates.
我不明白的是为什么它不报告日期。 Importantly, when I change line2 to "line2=f.readline()", then I obtain ['20120928','20121128','0','0'].
重要的是,当我将line2更改为“line2 = f.readline()”时,我获得['20120928','20121128','0','0']。 Ok with the dates now, but I know that var1 exists, it seems it doesn't read the rest of the file?
好了现在的日期,但我知道var1存在,它似乎不读取文件的其余部分? If I omit "line2=f.read()", it spits out a vector of 0s for each line, except for my desired output.
如果我省略“line2 = f.read()”,它会为每一行吐出一个0的向量,除了我想要的输出。 How can I omit these 0s?
我怎么能省略这些0?
My desired output would be: ['20120928','20121128','1','0'] 我想要的输出是:['20120928','20121128','1','0']
Sorry for bothering. 很抱歉打扰。 Thank you anyway!
还是要谢谢你!
The line f.read()
will read the entire file into the variable line2
. 行
f.read()
将整个文件读入变量line2
。 If you want to read line by line you could skip the f.read()
all together and just iterate like so 如果你想逐行阅读,你可以一起跳过
f.read()
并像这样迭代
with open('read.txt', 'r') as f:
for line in f:
Otherwise as written, after you .read()
into line2
there is no more text to read out of f
as it is all contained in the line2
variable. 否则按照写入,在
.read()
到line2
之后,没有更多的文本可以读出f
因为它全部包含在line2
变量中。
line2 = f.read()
将整个文件读入line2
,因此for line in f:
loop中没有什么可以读取你的for line in f:
。
The way I went through it was finally the following: 我经历过的方式终于如下:
exemptions = [] #vector I want
with open('read.txt', 'r') as f:
line2 = "" # create an empty string variable out of the "for line" loop
for line in f:
line2 = line2 + line #append each line to the above created empty string
if "CONFORMED PERIOD REPORT" in line:
exemptions.append(line.strip('\n').replace("CONFORMED PERIOD REPORT:\t", "")) # add line without stating CONFORMED PERIOD REPORT, just with the date)
elif "DATE OF REPORT" in line:
exemptions.append(line.rstrip('\n').replace("DATE OF REPORT:\t", "")) # idem above
var1 = re.findall("string1", line2, re.I) # find string1 in line2, case-insensitive
if len(var1) > 0: # if the string appears, it will have length>0
exemptions.append('1')
else:
exemptions.append('0')
var2 = re.findall("string2", line2, re.I)
if len(var2) > 0:
exemptions.append('1')
else:
exemptions.append('0')
print(exemptions)
So far this is what I got. 到目前为止,这就是我所得到的。 It worked for me, although I guess working with beautifulsoup would increase the efficiency of the code.
虽然我认为使用beautifulsoup可以提高代码的效率,但它对我有用。 Next step :)
下一步 :)
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