Check that all file exists.

    :param fileList: the list of file to check.

    :type fileList: list

    Check if all the files in ``fileList`` exists.

def allFileExists(fileList):
    """Check that all file exists.

    :param fileList: the list of file to check.

    :type fileList: list

    Check if all the files in ``fileList`` exists.

    """
    allExists = True
    for fileName in fileList:
        allExists = allExists and os.path.isfile(fileName)
    return allExists