Python: Boto3: get_metric_statistics() only accepts keyword arguments - amazon-web-services

Question

Just started using Boto3 with Python so definitely new at this.
I'm trying to use a simple get_metric_statistics script to return information about CPUUtilization for an instance. Here is the script I'm looking to use:
import boto3
import datetime
cw = boto3.client('cloudwatch')
cw.get_metric_statistics(
300,
datetime.datetime.utcnow() - datetime.timedelta(seconds=600),
datetime.datetime.utcnow(),
'CPUUtilization',
'AWS/EC2',
'Average',
{'InstanceId':'i-11111111111'},
)
but I keep getting the following message:
Traceback (most recent call last):
File "C:..../CloudWatch_GetMetricStatistics.py", line 13, in <module>
{'InstanceId':'i-0c996c11414476c7c'},
File "C:\Program Files\Python27\lib\site-packages\botocore\client.py", line 251, in _api_call
"%s() only accepts keyword arguments." % py_operation_name)
TypeError: get_metric_statistics() only accepts keyword arguments.
I have:
Looked at the documentation on Boto3 and I believe I have got everything correctly written/included
Set the correct region/output format/security credentials in the .aws folder
Googled similar problems with put_metric_statistics, etc to try and figure it out
I'm still stuck as to what I'm missing?
Any guidance would be much appreciated.
Many thanks
Ben

Answer 1

This works:
import boto3
import datetime
cw = boto3.client('cloudwatch')
cw.get_metric_statistics(
Period=300,
StartTime=datetime.datetime.utcnow() - datetime.timedelta(seconds=600),
EndTime=datetime.datetime.utcnow(),
MetricName='CPUUtilization',
Namespace='AWS/EC2',
Statistics=['Average'],
Dimensions=[{'Name':'InstanceId', 'Value':'i-abcd1234'}]
)
To find the right values, I use the AWS Command-Line Interface (CLI):
aws cloudwatch list-metrics --namespace AWS/EC2 --metric-name CPUUtilization --max-items 1
It returns information such as:
{
"Metrics": [
{
"Namespace": "AWS/EC2",
"Dimensions": [
{
"Name": "InstanceId",
"Value": "i-abcd1234"
}
],
"MetricName": "CPUUtilization"
}
],
"NextToken": "xxx"
}
You can then use these values to populate your get_metric_statistics() requet (such as the Dimensions parameter).

Answer 2

Refer to the documentation, and your error message:
get_metric_statistics() only accepts keyword agruments
Named arguments must be passed to the function as is defined in the docs:
get_metric_statistics(**kwargs)

Answer 3

have you used region_name when trying to get details. Can you share your github to know better, what you are doing.