What is the significance of using the 'astype' method in Pandas?
Instruction: Discuss the importance and scenarios of changing the data type of DataFrame columns.
Context: Candidates should explain how and why changing the data type of DataFrame columns with 'astype' is used in data preprocessing and manipulation.
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astype requests a dtype conversion. It is useful after validating that the conversion preserves the intended values; it is not a general parser, binning function or semantic validator.
```python import pandas as pd...