Question

我想从输入文件中读取特定数据。我怎么读呢？

例如，我的文件包含以下数据：

this is my first line
this is my second line.

所以我只想阅读第一行的first和第二行的secon。

Answer 1

请根据您的需要尝试以下代码，但请阅读上述评论。

# ----------------------------------------
# open text file and write reduced lines
# ----------------------------------------
#this is my first line
#this is my second line.
pathnameIn = "D:/_working"
filenameIn = "foobar.txt"
pathIn = pathnameIn + "/" + filenameIn

pathnameOut = "D:/_working"
filenameOut = "foobar_reduced.txt"
pathOut = pathnameOut + "/" + filenameOut

fileIn = open(pathIn,'r')
fileOut = open(pathOut,'w')

print(fileIn)
print(fileOut)

i = 0

# Save all reduced lines to a file.
for lineIn in fileIn.readlines():
    i += 1 # number of lines read
    lineOut = lineIn[11:16]
    fileOut.writelines(lineOut +"\n") 

print("*********************************")
print("gelesene Zeilen: " + str(i))
print("*********************************")

fileIn.close()
fileOut.close()

Python从输入文件中读取数据

1 个答案: