"No appropriate python interpreter found. command terminated with exit code 1" - kubernetes

Question

I am trying to perform replication in Cassandra. The cassandra nodes are setup in kubernetes. I am running it locally. I am just a beginner. I am unable to run cqlsh on the cassandra pods.
The configuration file for the pods is:
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: cassandra
labels:
app: cassandra
spec:
serviceName: cassandra
replicas: 3
selector:
matchLabels:
app: cassandra
template:
metadata:
labels:
app: cassandra
spec:
terminationGracePeriodSeconds: 1800
containers:
- name: cassandra
image: gcr.io/google-samples/cassandra:v14
imagePullPolicy: Always
ports:
- containerPort: 7000
name: intra-node
- containerPort: 7001
name: tls-intra-node
- containerPort: 7199
name: jmx
- containerPort: 9042
name: cql
resources:
limits:
cpu: "100m"
memory: 1Gi
requests:
cpu: "100m"
memory: 1Gi
securityContext:
capabilities:
add:
- IPC_LOCK
lifecycle:
preStop:
exec:
command:
- /bin/sh
- -c
- nodetool drain
env:
- name: MAX_HEAP_SIZE
value: 512M
- name: HEAP_NEWSIZE
value: 100M
- name: CASSANDRA_SEEDS
value: "cassandra-0.cassandra.default.svc.cluster.local"
- name: CASSANDRA_CLUSTER_NAME
value: "K8Demo"
- name: CASSANDRA_DC
value: "DC1-K8Demo"
- name: CASSANDRA_RACK
value: "Rack1-K8Demo"
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
# readinessProbe:
# exec:
# command:
# - /bin/bash
# - -c
# - /ready-probe.sh
# initialDelaySeconds: 20
# timeoutSeconds: 10
# These volume mounts are persistent. They are like inline claims,
# but not exactly because the names need to match exactly one of
# the stateful pod volumes.
volumeMounts:
- name: cassandra-data-storage
mountPath: "/mnt/data"
volumes:
- name: cassandra-data-storage
persistentVolumeClaim:
claimName: cassandra-claim
# These are converted to volume claims by the controller
# and mounted at the paths mentioned above.
# do not use these in production until ssd GCEPersistentDisk or other ssd pd
# volumeClaimTemplates:
# - metadata:
# name: cassandra-claim
# spec:
# storageClassName: localstorage
# accessModes: ["ReadWriteOnce"]
# resources:
# requests:
# storage: 1Gi
# selector:
# matchLabels:
# type: local
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: cassandra-data-volume
labels:
type: local
spec:
storageClassName: local-storage
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: cassandra-claim
spec:
storageClassName: local-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
Details of pods running & the error:
ubuntu#ubuntu-VirtualBox:~/cassandra$ k get all
NAME READY STATUS RESTARTS AGE
pod/nginx-sample-9456bbbf9-9v78w 1/1 Running 2 (40m ago) 18h
pod/nginx-sample-9456bbbf9-4kdq5 1/1 Running 2 (40m ago) 18h
pod/nginx-sample-9456bbbf9-4nc8d 1/1 Running 2 (40m ago) 18h
pod/cassandra-1 1/1 Running 0 12m
pod/cassandra-2 1/1 Running 0 12m
pod/cassandra-0 1/1 Running 0 12m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.152.183.1 <none> 443/TCP 25d
service/cassandra ClusterIP None <none> 9042/TCP 170m
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/nginx-sample 3/3 3 3 18h
NAME DESIRED CURRENT READY AGE
replicaset.apps/nginx-sample-9456bbbf9 3 3 3 18h
NAME READY AGE
statefulset.apps/cassandra 3/3 12m
ubuntu#ubuntu-VirtualBox:~/cassandra$ kubectl exec --stdin --tty cassandra-0 -- cqlsh
No appropriate python interpreter found.
command terminated with exit code 1
ubuntu#ubuntu-VirtualBox:~/cassandra$ kubectl exec --stdin --tty cassandra-0 -- /bin/bash
root#cassandra-0:/# cqlsh
No appropriate python interpreter found.
root#cassandra-0:/#