code: def mmwrite(
      target, a, comment="", field=None, precision=None, symmetry=None
  ):
      """
      Writes the sparse or dense array `a` to Matrix Market file-like `target`.
  
      Parameters
      ----------
      target : str or file-like
          Matrix Market filename (extension .mtx) or open file-like object.
      a : array like
          Sparse or dense 2D array.
      comment : str, optional
          Comments to be prepended to the Matrix Market file.
      field : None or str, optional
          Either 'real', 'complex', 'pattern', or 'integer'.
      precision : None or int, optional
          Number of digits to display for real or complex values.
      symmetry : None or str, optional
          Either 'general', 'symmetric', 'skew-symmetric', or 'hermitian'.
          If symmetry is None the symmetry type of 'a' is determined by its
          values.
      """
      MMFile().write(target, a, comment, field, precision, symmetry)
  
imports: from __future__ import division, print_function, absolute_import
  import os
  import sys
  from numpy import asarray, real, imag, conj, zeros, ndarray, concatenate, ones, can_cast
  from numpy.compat import asbytes, asstr
  from scipy._lib.six import string_types
  from scipy.sparse import coo_matrix, isspmatrix
label_desc: Use image node_id 3 for calling a global function with example usage: mmwrite(target, a, comment, field, precision, symmetry) without return types