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How to add multiple songs to a playlist using Spotify API?

I've been having trouble adding multiple songs to my playlist on spotify. Here is what part of my code looks like so far:
def add_selected_songs(songs, playlist_id):
ACCESS_TOKEN = input('Provide Access Token: ')
request_data = json.dumps(songs)
URL = f'https://api.spotify.com/v1/playlists/{playlist_id}/tracks'
response = requests.post(
URL,
data=request_data,
headers={
"Content-Type": "application/json",
"Authorization": f"Bearer {ACCESS_TOKEN}"
})
response_json = response.json()
return response_json
The 'songs' variable is an array of song uris I have added from another playlist.
They print out in the following format:
['spotify:track:75s1b4uRCk6UPOPBLNdDIA', 'spotify:track:3hqJdqziOPbu422kXaOyII', 'spotify:track:6rdKHwxWa9aqWyoGf1r20v', 'spotify:track:6xQdHOX1Tq3IrKsQdLs0nc', 'spotify:track:66g4mn8jSks0Hu1zEcc81G']
I think something might be wrong with the uris or how i did the requests.post() jargon that I still don't understand fully. I don't really know a lot about json, and what little I understand of the spotify api is from youtube videos. I am able to do most things to my playlist like retrieve playlist information like songs and such, and I can add each song individually, but I just can't add multiple songs in one request. If someone could please help me figure out what I am doing wrong that would be much appreciated!
Edit:
Here's what I changed to my code thanks to you guys and your helpful feedback!! Thanks everyone!
def add_selected_songs(songs, playlist_id):
ACCESS_TOKEN = input(Provide Access Token: ')
songList = '%2C'.join(songs)
while(songList.find(':') != -1):
songList = songList.replace(':','%3A')
URL = BASE_URL + f'/playlists/{playlist_id}/tracks?uris={songList}' #forgot to even add the uris earlier too lol
response = requests.post(
URL,
headers={
"Accept": "application/json",
"Content-Type": "application/json",
"Authorization": f"Bearer {ACCESS_TOKEN}"
})
response_json = response.json()
return response_json

Spotify Developers page is helpful in a way that will show you how exactly should the request look like: https://developer.spotify.com/console/post-playlist-tracks/
If you try to fill in at least two song ID's, e.g.:
spotify:track:3hqJdqziOPbu422kXaOyII,spotify:track:3hqJdqziOPbu422kXaOyII
You will notice the POST request on right side:
"https://api.spotify.com/v1/playlists/playlist_id/tracks?uris=spotify%3Atrack%3A3hqJdqziOPbu422kXaOyII%2Cspotify%3Atrack%3A3hqJdqziOPbu422kXaOyII"
Request does not accept special characters, however ASCII keycodes, so you should join the song IDs by %2C and replace the : with %3A.

Finding the content length of a multipart image

I'm trying to submit a multipart image to a post request and I am frequently getting a "414 Request-URI Too Large" error when trying to post it. I'm wondering if my headers for submitting the photo are incorrect, because I noticed that most posts require content-length, boundaries, etc.
I'm wondering if some of that parameters are supposed to be auto filled or if I'm supposed to submit them myself.
This is a snippet of my code that can give an example of what I'm doing
with open(imageFile, 'rb') as f:
headers = {"Authorization": "Token mytoken", "Content-type": "multipart/form-data"}
r = requests.post('https://api.findface.pro/v1/detect', params={"photo": f},headers=headers)
Sorry if this post isn't formatted correctly, this is my first post on SO.

The image (as a multipart data) can't be sent trough an url parameter.
In your example the "post" request would be this->
https://api.findface.pro/v1/detect/
You should send the data this way to the server:
with open(imageFile, 'rb') as file:
headers = {"Authorization": "Token mytoken",
"Content-type": "multipart/form-data"}
data = {'photo': file}
r = requests.post('https://api.findface.pro/v1/detect', data = data,headers=headers)

Python HTTP Post with upload file and headers generated from Postman

I'm using Python 2.7.
I want to make a HTTP POST using requests, where I upload a file and a key that must go in the HTTP Headers.
For that I've used the application Postman, where it works really fine.
On Postman I've added only the necessary header, which is a Authorization with some key.
On the body, Ive choosen form-data and then the key is an input_image, and they the image itself.
Now I want to replicate this into Python2.7, so I've chose to see the Python code on Postman, which was this one:
import requests
url = "https://foo.com/bar/stuff"
payload = "------WebKitFormBoundary7MA4YDxkTrZu1gW\r\nContent-Disposition: form-data; name=\"input_image\"; filename=\"C:\\Test\\projs\\Supermarket\\doritos.jpeg\"\r\nContent-Type: image/jpeg\r\n\r\n\r\n------WebKitFormBoundary7MA4YDxkTrZu1gW--"
headers = {
'content-type': "multipart/form-data; boundary=----WebKitFormBoundary7MA4YDxkTrZu1gW",
'Authorization': "myAuthorizationKey",
'Cache-Control': "no-cache",
'Postman-Token': "0efwd6e8-051c-4ed5-8d6f-7b1bd135f4d5"
}
response = requests.request("POST", url, data=payload, headers=headers)
print(response.text)
This simply doesn't work. It has the same behaviour as if I didn't send any image using Postman. It looks like the payload string is not being send correctly.
Question:
What is wrong with this Postman auto-generation code in order to send a HTTP POST with image upload and with header at the same time in Python?

I think Postman is doing some logic we are not really aware of. But the package requests provide a way to upload images.
files = {'media': open('my_image.jpg', 'rb')}
r = requests.post(url, files=files, headers=hearders)
According to the server you are sending the image to, the parameters name, this code might need to be slightly changed.

the only trick works here is your code should be same as you post request in postman, no extra headers need to be added , your post request should look like the same as it is in postman.
I could do this by changing my file to an image file and then posting it in my post request.
with open('grass-small.png', 'rb') as imageFile:
imageStr = base64.urlsafe_b64encode(imageFile.read())
files = {'document': ('grass-small.png', imageStr ), 'document_type':(None,'grass')}

This worked for me
import requests
url = 'http://iizuka.cs.tsukuba.ac.jp/projects/colorization/web/'
files = {'file': ("my_img_path/myImage.jpeg", open('my_img_path/myImage.jpeg', 'rb'),'image/jpg')}
r = requests.post(url, files=files)

Python mulitpart/formdata POST request within Zapier Code

I'm currently working with Zapier to automate some tasks but I got stuck on the following :
I'm trying to send a POST request using the Zapier Webhooks containing a file. I could make it work trough postman as the API of Debitoor (that's where I am sending to) is pretty clear.
However, I can not make it work within Zapier Webhooks. I also tried to use Zapier Code (Python) as I can view the python code from the postman. But I am not familiar with that and might need some help to get it started.
1.) First of all, this is the API reference: https://developers.debitoor.com/api-reference#files
2.) I then used Postman with this code (Python requests)which was working :
import requests
url = "https://api.debitoor.com/api/files/v1"
querystring = {"token":"eyJ1c2VyIjoiNWE0NmVjYjUxOTE0ODEwMDFjMTkxYzZmIiwiYXBwIjoiNTdiMmZlMDkxZTkwMjQwZjAwNDZhNWEyIiwiY2hhbGxlbmdlIjowLCIkZSI6MCwiJHQiOjE1MjE4NzAwNTQ1OTd9CsKRw5xbw5_DhHUWw5QJw4zDj8KnXsOaeMKA","fileName":"test.pdf"}
payload = "------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"file\"; filename=\"Bildschirmfoto 2018-04-05 um 09.59.46 1.png\"\r\nContent-Type: image/png\r\n\r\n\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--"
headers = {
'content-type': "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW",
'cache-control': "no-cache",
'postman-token': "716e7723-2dc1-6384-059d-960feb563443"
}
response = requests.request("POST", url, data=payload, headers=headers, params=querystring)
print(response.text)
3.) Tried to copy the code to Zapier Code, but I don't know how to implement the file. In Zapier I am triggering an inbound email to grab the attachment, which is then "hydrated". It looks like this :
hydrate|||.eJwtjMsOwiAUBf_lrosKNFDZu3Xh1hjC46KklTaFxDRN_11qXJ7JzFkhplxMcqijB8U5l7yT5wZCxMHrZN4Iqo4BMzTgXuh63eMCioruLKiobEwFU9FlmXb1WrX-Y-ZnBrX-Qj2NsSpzBfcV_o-3C2GUisPkwx7sj5D5UQpDmeMnwqW1pPWBE-OYJdYwdCJQT9sWtse2fQEK1Tjl:1eqY0S:s2Ek27XO54PVSm9q_mVMDN8o1uY|||hydrate
How do I connect the Python code to the hydrated file? I have no experience with files and could not find any useful help. Hope someone has an idea?

I was trying to import AWS S3 files to my API.
It turns out that Zapier hydrated my file just as described here.
Then I successfully extracted the content of my file and sent it to my API like this:
import urllib.request
auth_token = input_data['auth_token'] # Authentication token for my API
csv_file = input_data['csv_file'] # The "hydrate|||..." variable: that's my S3 file
file_type = 'text/csv'
fp = urllib.request.urlopen(csv_file)
file_bytes = fp.read() # Binary content of my S3 file
fp.close()
url = 'http://my.api.com/importer/resource'
headers = {
'accept': 'application/vnd.api-v1+json',
'authorization': auth_token,
'user-agent': 'Zapier'
}
files = {'csv_file': ('bulk_resources.csv', file_bytes, file_type, {'Expires': '0'})}
response = requests.post(url, headers=headers, files=files)
return response.json()

POST multipart-form image with python through rest API call

I am relatively new to python and enjoying every day I program in it. I have been looking around for a possible solution to figure out how to post an image in a multipart-form, binary format, with a form tag. The API I am trying to call is expecting a binary image in a form.
The request payload sample I have is:
----WebkitFormBoundaryM817iTBsSwXz0iv8
Content-Disposition: form-data, name="image"; filename="123BMW.jpg"
Content-Type: image/jpeg
----WebkitFormBoundaryM817iTBsXwxz0iv8
I have tried several ideas based on some basic requests examples.
Any ideas, thoughts or pointers on where to start looking for such a solution?
def Post_Image(urlPath, filePath, fileName):
url = urlPath headers = {'content-type': 'multipart/form-data'}
files = {'file':(fileName, open(filePath,'rb'))}
payload = {"Content-Disposition": "form-data", "name":fileName}
payload = urllib.urlencode(payload)
resp = requests.post(url, data=payload, headers=headers, files= files)

The problem is you're setting both the data and files parameters, this part of the code sample here:
payload = urllib.urlencode(payload)
resp = requests.post(url, data=payload, headers=headers, files= files)
If both are present, and data value is a string, only it will be in the request. Drop it, and the files will be present.