About

nim-pythonfile is a Nim module to wrap the file functions and provide an interface as similar as possible to that of Python.

Examples:

# Open a file for reading, read and print one line, then read and store the next ten bytes.
var f : PythonFile = open("my_file.txt", "r")       # f = open("my_file.txt", "r")
echo(f.readline())                                  # print(f.readline())
var s : string = f.read(10)                         # s = f.read(10)
f.close()                                           # f.close()

# Open a file for writing, write "Hello World!", then write multiple lines at once.
var f : PythonFile = open("my_file.txt", "w")       # f = open("my_file.txt", "w")
f.write("Hello World!")                             # f.write("Hello World!")
f.writelines(["This", "is", "an", "example"])       # f.writelines(["This", "is", "an", "example"])
f.close()                                           # f.close()

# Open a file for reading or writing, then read and write from multiple locations
# using seek() and tell().
var f : PythonFile = open("my_file.txt", "r+")      # f = open("my_file.txt", "r+")
f.seek(10)                                          # f.seek(10)
echo(f.read())                                      # print(f.read())
echo(f.tell())                                      # print(f.tell())
f.seek(0)                                           # f.seek(0)
f.seek(-50, 2)                                      # f.seek(-50, 2)
f.write("Inserted at pos 50 from end")              # f.write("Inserted at pos 50 from end")
f.close()                                           # f.close()

Note that due to some inherent differences between how Nim and Python handle files, a complete 1 to 1 wrapper is not possible. Notably, Nim has no equivalent to the newlines and encoding properties, and while they are present in this implementation they are always set to nil. In addition, the fileno() procedure functions differently from how it does in Python, yet it has the same basic functionality. Finally, the itatty() procedure will always return false.

For general use, however, this wrapper provides all of the common Python file methods.

License

nim-pythonfile is released under the MIT open source license.