How to write to the file with a variable .format?

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I want to write two strings into a file with variable white-spaces between. Here's the code I wrote:

width = 6
with open(out_file, 'a') as file:
    file.write("{:width}{:width}\n".format('a', 'b'))

But I get ValueError: Invalid conversion specification from it. I expected it to write characters a and b with 6 spaces between in one line into the file.

I am using python 2.

You need to change the format string a little and pass width as a keyword argument to the format() method:

width = 6
with open(out_file, 'a') as file:
    file.write("{:{width}}{:{width}}\n".format('a', 'b', width=width))

Contents of file afterwards:

a     b     

Writing files in Python — Hyperion 0.9.10 documentation, The best way to write out variables with this technique is to use string formatting which is described in more detail here. The basic command to format variables� where format is a string containing the format statements and variables is a tuple of the values, for example: >>> print " %s %5.2f %10.4e " % ( "name" , 3.4 , 1.e-10 ) name 3.40 1.0000e-10 We can use this when writing out files, so if we have two lists or arrays of values a and b we can do:

I googled a little and found this. With some changes, I wrote this code which I tried and got your desired output:

width = 6
with open(out_file, 'a') as file:
    f.write("{1:<{0}}{2}\n".format(width, 'a', 'b'))

7. Input and Output — Python 3.8.5 documentation, (A third way is using the write() method of file objects; the standard output file can a variable will be substituted and can provide detailed formatting directives,� The first command, saves the output of Get-Process in the Process variable. The second command appends the output from the variable to the file. You can use one of the methods covered in this Itechguide to use PowerShell to write to file (or append to an existing file)! I hope you found this Itechguide helpful.

A simple multiplication will work here (multiplication operator is overloaded here)

width = 6
charector = ' '
with open(out_file, 'a') as file:
    file.write('a' + charector * width + 'b')

Day 11 -- Formatting Your Output, The simplest way to do this is to pass the file to write to as an argument to write. For example, to write to the file represented by the file variable MYFILE using the print format MYFILE, you can use the following statement: write (MYFILE); Excel VBA Write Text File. In VBA we can open or read or write a text file, to write a text file means the data we have in an excel sheet and we want it to a text file or a notepad file, there are two methods to do, one is by using the File System object property of VBA and another is by using the Open and write method in VBA.

It's a bit ugly but you can do this. Using {{}} you can type a literal curly brace, and by that, you can format your format string with a variable width.

width = 6

format_str = "{{:{}}}{{:{}}}\n".format(width, width) #This makes the string "{:width}{:width}" with a variable width.


with open(out_file, a) as file:
    file.write(format_str.format('a','b'))

EDIT: If you want to apply this type of variable width pattern to any of your patterns used in a code, you could use this function:

import re
def variable_width_pattern(source_pattern, width):
    regex = r"\{(.*?)\}"
    matches = re.findall(regex, source_pattern)
    args = ["{{:{}}}".format(width) for x in range(len(matches))]
    return source_pattern.format(*args)

WRITE WORK FILE, Work File Type, Handling FORMATTED, A dynamic variable is written in its currently defined length� When you call fprintf with the format specifier %s, you cannot put a null character in the middle of the input character vector. To write a null character, use fprintf(fid, '%c', char(0)). Input argument types must match their format types.

Write data to text file - MATLAB fprintf, example. fprintf( formatSpec , A1,,An ) formats data and displays the results header text x and exp(x) , and the second call prints the values from variable A . To use the format feature of Perl, you have to define a format first and then you can use that format to write formatted data. Define a Format. Following is the syntax to define a Perl format − format FormatName = fieldline value_one, value_two, value_three fieldline value_one, value_two . Here FormatName represents the name of the format.

How do I write out a fixed-format file in SAS?, We set the dataset with the variables we wish to write out, indicate the file to which we will write them out in the file statement, and then specify each variables � The string type is probably the most popular variable in PowerShell. I don't think I've ever written a script that didn't contain at least one string. Strings are great to define a simple set of characters like a computer name, path to a text file, a registry keypath, a URL and so on. Expanding variables inside of strings and using PowerShell's string format capabilities, you can do just about

Writing to Variable-Format Text Files, In a file with variable-length records, each record may be a different length. The variable length formats permit both variable-length records and variable-length� This tutorial covers the following topic – Python Write File/Read File. It describes the syntax of the writing to a file in Python. Also, it explains how to write to a text file and provides several examples for help.

Comments
  • Please provide more information. What are you expecting to be done? What is your goal when writing this code?
  • I am trying to printout certain format to the file example, "a b " , the empty space between word is something i want to control in this case.
  • Please edit your question and add the details to it, so everyone can see it when they are trying to help you.
  • This one goes well, thanks, i think it fits perfectly for what i looking for!
  • This is a bit difficult because i actually have tons of line that required different variable for the space format, and by doing this it required double of the lines to accomplish the work.
  • @user1550596 Well this is the solution. You could define a function which takes a width and the source pattern, and then produces the format_str by putting the formatted curly braces inside your pattern.