[Python] Problème avec mon API en python

Well, I am a work-study student and I am asked to create an API to retrieve data from their software. (I don't know much about API I discovered with this project, so please don't judge my stupid mistakes).

The documentation : https://api.sellsy.fr/documentation/methodes

try:
infos = client.api(method='Client.getList', params={
'search'={
'periodecreated_start'={int(1577836800)}
}
})
except sellsy_api.SellsyAuthenticateError as e:
print('Authentication failed ! Details : {}'.format(e))
except sellsy_api.SellsyError as e:
print(e)


I am getting this error:

infos = client.api(method='Client.getList', params={
^
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?


Here I am trying to get out the list of clients since 01/01/2020.

Thank you in advance,

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