[英]A program which will modify another program by using python 3
I am trying to write a program in python which will modify another python program. 我试图用python编写程序,它将修改另一个python程序。 Steps will be as follows: 步骤如下:
(pyh.py)
which contains below-mentioned lines and output is as follows 我有一个包含以下各行的程序(pyh.py)
,输出如下 output: 输出:
Number of lines: 6
Number of characters: 65
code for pyh.py
: pyh.py
代码:
import os
import sys
def pyh( filename ):
if ( os.path.isfile( filename ) ):
file = open( filename, 'r' )
line_list = file.readlines()
pyh_compute_size( line_list )
file.close()
else:
print( "File " + filename + " does not exist." )
def pyh_compute_size( line_list ):
line_count = 0; char_count = 0
for line in line_list:
line_count += 1
char_count += len( line )
print( "Number of lines: " + str( line_count ) )
print( "Number of characters: " + str( char_count ) )
if __name__ == '__main__':
pyh( "text_a.txt" )
modifier.py
' which will open ' pyh.py
' (in the same directory) and read the file then close it. 我正在尝试做的是,我正在编写另一个名为“ modifier.py
”的python程序,该程序将打开“ pyh.py
”(在同一目录中)并读取文件,然后将其关闭。 pyh.py
' for writing. 然后打开相同的文件“ pyh.py
”进行写入。 It will go through the list of line and write line 1 to 20 in the new file ( modifier.py
). 它将遍历行列表,并将行1到20写入新文件( modifier.py
)。 After that, it removes the newline from the end of it, and add; 之后,它从末尾删除换行符,然后添加; print ("Additional Part"
) to the end, and then add a newline. 在末尾print ("Additional Part"
),然后添加换行符。 modifier.py
). 在那之后,它将从21写入到新文件( modifier.py
)的结尾。 When I run the 'modifier.py'
it will modify the 'pyh.py'
(for line between 20 & 21). 当我运行'modifier.py'
,它将修改'pyh.py'
(对于20和21之间的行)。 When 'pyh.py'
is modified then it should show the below output. 修改'pyh.py'
后,应显示以下输出。
Additional Part
Additional Part
Number of lines: 6
Number of characters: 65
I am trying to do the step 3 & 4 but unable to find the appropriate way. 我正在尝试执行第3步和第4步,但是找不到合适的方法。 I am new in python. 我是python的新手。 So it would be really great if someone helps me to solve it. 因此,如果有人帮助我解决问题,那将是非常不错的。
code for modifier.py
is as follow: modifier.py
代码如下:
import os
import sys
def pyh_new( filename ):
if ( os.path.isfile( filename ) ):
file = open( filename, 'r' )
line_list = file.readlines()
file.close()
def pyh_new( filename ):
if ( os.path.isfile( filename ) ):
file = open( filename, 'w' )
line_list = file.writelines()
#need to write
file.close()
if __name__ == '__main__':
pyh_new( "pyh.py" )
You have pyh_new listed twice. 您已列出pyh_new两次。 What you could do is call the name of the first one phy_new_read, and the second one phy_new_write. 您可以做的是调用第一个phy_new_read和第二个phy_new_write的名称。 Then you would want to make phy_new_read return the line_list. 然后,您需要使phy_new_read返回line_list。 return line_list
. return line_list
。 You would then be able to do: 然后,您将可以执行以下操作:
if __name__ == '__main__':
lines = pyh_new_read( "pyh.py" )
#grab the specific lines that you want. See
# https://stackoverflow.com/questions/2081836/reading-specific-lines-only-python
pyh_new_write( lines )
See the following question for how to get specific lines from a file Reading specific lines only (Python) 有关如何从文件中获取特定行的信息,请参见以下问题: 仅读取特定行(Python)
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