Append Data without drop table with python

We have similar issue when using DATAIKU with R API dkuWriteDataset by default does not append data. It always overwrite the data. How can I force append the data when calling the API outside dataiku flow. In reviewing the source code for the API looks like the code is doing the following:

1. default the append mode to false. Code reference (appendMode <- FALSE)
2. Get flow spec using function(getDkuFlowSpec())
3. Set appendMode based on flowspec appendmode configuration.

Would appreciate if you could let me know how we can configure dataset with appendMode so that when we use the API it always write with append option.

Following is source code for the R API dkuWriteDataset that I am referencing above

appendMode <- FALSE
parsedRSpec <- getDkuFlowSpec()
print(parsedRSpec[["out"]])
if (is.null(parsedRSpec)) {
name <- dku__resolve_smart_name(name)
tmpFilePath <- tempfile(pattern = "r-data-")
currentActivityId <- ""
streamFile <- TRUE
}
else {
sharedTmpDir <- parsedRSpec$tmpDir
if (is.na(file.info(sharedTmpDir)$isdir) || !file.info(sharedTmpDir)$isdir) {
name <- dku__resolve_smart_name(name)
tmpFilePath <- tempfile(pattern = "r-data-")
streamFile <- TRUE
}
else {
tmpFilePath <- tempfile(tmpdir = sharedTmpDir)
streamFile <- FALSE
}
if (partition != "") {
stop("You cannot explicitly set partitions when running within Dataiku Flow")
}
found = FALSE
for (out in parsedRSpec[["out"]]) {
if (out[["fullName"]] == name || out[["smartName"]] ==
name) {
if (!("partition" %in% names(out))) {
partition = ""
}
else if (is.null(out[["partition"]])) {
partition = ""
}
else {
partition = out[["partition"]]
}
name = out[["fullName"]]
if (!(is.null(out[["appendMode"]]))) {
appendMode <- out[["appendMode"]]
}
found = TRUE
}
}