Not sure about the Python ones, but the Ruby read/write file examples aren't quite fully done/correct here:

  # Equivalent of file_put_contents() in PHP
  # This could also be used for appending if the correct mode is specified.
  File.open("filename", "w") { |f| f.write("some data") }

  # Equivalent of file_get_contents() in PHP
  some_var = File.read("filename")