I have an output file with a load of information in and I want to read a number value that appears after a specific word.
In my file, I have a line such as
"Final energy, E = -82137.1098 eV"
What I would like to do is search my file for the string 'Final energy' and then read and store the number value.
So far I have managed to search the file for 'Final energy' and print the entire line containing that string but I can't seem to find a way to then read the number.
So far my code goes like this
energystring = 'Final energy'
with open(filename, 'r') as file:
for line in file:
if energystring in line:
energyline = line
print(energyline)
Thank you for any help you can give.
You just need to parse the number out of the string then. You can split the string on whitespace to get all the words, try to cast each word to a float, and get the one that works. Since there's only one number in the string, whatever successfully casts to float is your energy number.
def get_energy_level(line):
for word in line.split():
try:
return float(word)
except ValueError:
pass
with open(filename, 'r') as file:
for line in file:
if energystring in line:
energy_level = get_energy_level(line)
I have a binary file consisting only of hex numbers.
I want to open the file and create a list with each element of the list consisting
of 1 hexanumber of the file (e.g. 1 byte => AB for example would be 1 element).
I tried it with the "with open" and "readlines" commands and then split the lines into the element size i wanted but failed.
Also it somehow didn´t include a specific Hex number (in my case 0A).
my code is
with open(r"C:\Users\James\Desktop\Test1.bin","rb") as file:
fileread = file.read
linesread = file.readlines()
splitted = linesread.split('\\')
print(splitted)
How do i go about?
Thanks for help
I have a program that I created with two sections.
The first one copies a text file with an integer in the middle of the file name in this format.
file = "Filename" + "str(int)" + ".txt"
the user can create as many copies of the file that they would like.
The second part of the program is what I am having the problem with. There is an integer at the very bottom of the file that is to correspond with the integer in the file name. After the first part is done, I open each file one at a time in "r+" read/write format. So I can file.seek(1000) to about where the integer is in the file.
Now in my opinion the next part should be easy. I should just simply have to write str(int) into the file right here. But it wasn't that easy. It worked just fine doing it like that in Linux at home, but at work on Windows it proved difficult. What I ended up having to do after file.seek(1000) is write to the file using Unicode UTF-8. I accomplished this with this code snippet of the rest of the program. I will document it so that it is able to be understood what is going on. Instead of having to write this in Unicode, I would love to be able to write this in good old regular English ASCII characters. Eventually this program will be expanded to include a lot more data at the bottom of each file. Having to write the data in Unicode is going to make things extremely difficult. If I just write the data without turning it into Unicode this is the result. This string is supposed to say #2 =1534, instead it says #2 =ㄠ㌵433.
If someone can show me what I am doing wrong that would be great. I would love to just use something like file.write('1534') to write the data to the file instead of having to do it in Unicode UTF-8.
while a1 < d1 :
file = "file" + str(a1) + ".par"
f = open(file, "r+")
f.seek(1011)
data = f.read() #reads the data from that point in the file into a variable.
numList= list(str(a1)) # "a1" is the integer in the file name. I had to turn the integer into a list to accomplish the next task.
replaceData = '\x00' + numList[0] + '\x00' + numList[1] + '\x00' + numList[2] + '\x00' + numList[3] + '\x00' #This line turns the integer into Utf 8 Unicode. I am by no means a Unicode expert.
currentData = data #probably didn't need to be done now that I'm looking at this.
data = data.replace(currentData, replaceData) #replaces the Utf 8 string in the "data" variable with the new Utf 8 string in "replaceData."
f.seek(1011) # Return to where I need to be in the file to write the data.
f.write(data) # Write the new Unicode data to the file
f.close() #close the file
f.close() #make sure the file is closed (sometimes it seems that this fails in Windows.)
a1 += 1 #advances the integer, and then return to the top of the loop
This is an example of writing to a file in ASCII. You need to open the file in byte mode, and using the .encode method for strings is a convenient way to get the end result you want.
s = '12345'
ascii = s.encode('ascii')
with open('somefile', 'wb') as f:
f.write(ascii)
You can obviously also open in rb+ (read and write byte mode) in your case if the file already exists.
with open('somefile', 'rb+') as f:
existing = f.read()
f.write(b'ascii without encoding!')
You can also just pass string literals with the b prefix, and they will be encoded with ascii as shown in the second example.
I have a Fortran code that asks the user for an input file name. The code processes that file and I would like to write out another file based on the original file name. I think if I can understand how to remove the file extension then I can just concatenate whatever I want to the end of that.
How do I strip off the file extension in a character?
character(len=256):: input_file, output_file
Original file: AnyName.xxx
Output file: AnyName_Output.csv
You can use scan to locate the position of the last dot in the string input_file. Then you can use that position to extract the input_file with no extension and concatenate the new one.
character(len=256):: input_file, output_file
integer :: ppos
character(len=3) :: new_ext="csv"
ppos = scan(trim(input_file),".", BACK= .true.)
if ( ppos > 0 ) output_file = input_file(1:ppos)//new_ext
I have a text file TF including a set of the following kind of strings:
"linStru.twoZoneBuildingStructure.north.airLeakage.senTem.T",
"linStru.twoZoneBuildingStructure.north.vol.Xi[1]",
"linStru.twoZoneBuildingStructure.south.airLeakage.senTem.T",
"linStru.twoZoneBuildingStructure.south.vol.Xi[1]", "
"linStru.twoZoneBuildingStructure.north_ext.layMul.nMat[1].monoLayer1Nf.T[1]",
"linStru.twoZoneBuildingStructure.north_ext.layMul.nMat[1].monoLayer2Nf.T[2]",
Given a line L, starting from the end let the substring s denote the portion of the string between ," and the first .
To make it clearer, for L=1: s=T, for L=2: s=Xi[1], for L=5: s=T[1], etc.
Given a text file TF in the above format, I want to write a MATLAB function which takes TF and replaces the corresponding s on each line with der(s).
For example, the function should change the above strings as follows:
"linStru.twoZoneBuildingStructure.north.airLeakage.senTem.der(T)",
"linStru.twoZoneBuildingStructure.north.vol.der(Xi[1])",
"linStru.twoZoneBuildingStructure.south.airLeakage.senTem.der(T)",
"linStru.twoZoneBuildingStructure.south.vol.der(Xi[1])", "
"linStru.twoZoneBuildingStructure.north_ext.layMul.nMat[1].monoLayer1Nf.der(T[1])",
"linStru.twoZoneBuildingStructure.north_ext.layMul.nMat[1].monoLayer2Nf.der(T[2])",
How can such a function be written?
Something like
regexprep(TF, '\.([^.]+)",$', '.der($1)",', 'dotexceptnewline', 'lineanchors')
It finds the longest sequence of non-dot characters appearing between a dot before and quote-comma-endline after, and encloses that inside der( ).
I see there is a small " typo on the fourth line of your text file. I'm going to remove this to make things simpler.
As such, the simplest way that I can see you do this is iterate through all of your strings, remove the single quotes, then find the point in your string where the last . occurs. Extract this substring, then manually insert the der() in between this string. Assuming that those strings are in a text file called functions.txt, you would read in your text file using textread to read in individual strings. As such:
names = textread('functions.txt', '%s');
names should now be a cell array of names where each element is each string encapsulated in double quotes. Use findstr to extract where the . is located, then extract the last location of where this is. Extract this substring, then replace this string with der(). In other words:
out_strings = cell(1, numel(names)); %// To store output strings
for idx = 1 : numel(names)
%// Extract actual string without quotes and comma
name_str = names{idx}(2:end-2);
%// Find the last dot
dot_locs = findstr(name_str, '.');
%// Last dot location
last_dot_loc = dot_locs(end);
%// Extract substring after dot
last_string = name_str(last_dot_loc+1:end);
%// Create new string
out_strings{idx} = ['"' name_str(1:last_dot_loc) 'der(' last_string ')",'];
end
This is the output I get:
celldisp(out_strings)
out_strings{1} =
"linStru.twoZoneBuildingStructure.north.airLeakage.senTem.der(T)",
out_strings{2} =
"linStru.twoZoneBuildingStructure.north.vol.der(Xi[1])",
out_strings{3} =
"linStru.twoZoneBuildingStructure.south.airLeakage.senTem.der(T)",
out_strings{4} =
"linStru.twoZoneBuildingStructure.south.vol.der(Xi[1])",
out_strings{5} =
"linStru.twoZoneBuildingStructure.north_ext.layMul.nMat[1].monoLayer1Nf.der(T[1])",
out_strings{6} =
"linStru.twoZoneBuildingStructure.north_ext.layMul.nMat[1].monoLayer2Nf.der(T[2])",
The last thing you want to do is write each line of text to your text file. You can use fopen to open up a file for writing. fopen returns a file ID that is associated with the file you want to write to. You then use fprintf to print your strings and name a newline for each string using this file ID. You then close the file using fclose with this same file ID. As such, if we wanted to output a text file called functions_new.txt, we would do:
%// Open up the file and get ID
fid = fopen('functions_new.txt', 'w');
%// For each string we have...
for idx = 1 : numel(out_strings)
%// Write the string to file and make a new line
fprintf(fid, '%s\n', out_strings{idx});
end
%// Close the file
fclose(fid);
Another way to do it with regexprep:
str_out = regexprep(str_in, '\.([^\.]+)"$','\.der($1)"');
Example: for
str_in = {'"linStru.twoZoneBuildingStructure.north.airLeakage.senTem.T"'
'"linStru.twoZoneBuildingStructure.north.vol.Xi[1]"'};
this gives
str_out =
'"linStru.twoZoneBuildingStructure.north.airLeakage.senTem.der(T)"'
'"linStru.twoZoneBuildingStructure.north.vol.der(Xi[1])"'