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A more flexible way of doing this could be with Pandas. After you record your data, you can sift through it to gather the information you need, add it to a dataframe, perform any operations on it, and save it to a .csv. For example, lets consider some points.

import rosbag
from geometry_msgs.msg import Point
import pandas as pd

# The bag file should be in the same directory as your terminal
bag = rosbag.Bag('./recorded-data.bag')
topic = '/your_topic'
column_names = ['x', 'y']
df = pd.DataFrame(columns=column_names)

for topic, msg, t in bag.read_messages(topics=topic):
    x = msg.location.x
    y = msg.location.y

    df = df.append(
        {'x': x,
         'y': y},
        ignore_index=True
    )

df.to_csv('out.csv')

A more flexible way of doing this could be with Pandas. After you record your data, you can sift through it to gather the information you need, add it to a dataframe, perform any operations on it, and save it to a .csv. For example, lets consider some points.

import rosbag
from geometry_msgs.msg import Point
import pandas as pd

# The bag file should be in the same directory as your terminal
bag = rosbag.Bag('./recorded-data.bag')
topic = '/your_topic'
column_names = ['x', 'y']
df = pd.DataFrame(columns=column_names)

for topic, msg, t in bag.read_messages(topics=topic):
    x = msg.location.x
msg.x
    y = msg.location.y
msg.y

    df = df.append(
        {'x': x,
         'y': y},
        ignore_index=True
    )

df.to_csv('out.csv')