Merging two pandas series can be done using the pandas concat() function. First, you need to import the pandas library. Then, use the concat() function to merge the two series along a specified axis, either row-wise or column-wise. You can also specify how to handle any missing values that may arise during the merging process. Finally, assign the merged series to a new variable or overwrite one of the original series.

## How to merge 2 pandas series using append method?

You can merge two pandas series using the append method by simply calling the append method on one of the series and passing the other series as an argument. Here's an example:

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import pandas as pd # Create two pandas series s1 = pd.Series([1, 2, 3]) s2 = pd.Series([4, 5, 6]) # Merge the two series using the append method merged_series = s1.append(s2) print(merged_series) |

This will output:

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0 1 1 2 2 3 0 4 1 5 2 6 dtype: int64 |

As you can see, the two series have been merged with the index values restarting from 0 for the second series.

## How to merge 2 pandas series while preserving the original indexes?

You can merge two pandas series while preserving their original indexes by using the `concat()`

function along with the `keys`

parameter. Here is an example:

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import pandas as pd # Create two pandas series s1 = pd.Series([1, 2, 3], index=[1, 2, 3]) s2 = pd.Series([4, 5, 6], index=[4, 5, 6]) # Merge the two series while preserving original indexes merged_series = pd.concat([s1, s2], keys=['s1', 's2']) print(merged_series) |

This will result in a new series where the original indexes are preserved, and each original series is identified with a key ('s1' and 's2').

## How to merge 2 pandas series using combine_first method?

You can merge two Pandas Series using the `combine_first`

method as follows:

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import pandas as pd # Create two sample Pandas Series s1 = pd.Series([1, 2, 3], index=['a', 'b', 'c']) s2 = pd.Series([4, 5], index=['b', 'c']) # Merge the two Series using combine_first method merged_series = s1.combine_first(s2) print(merged_series) |

Output:

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a 1.0 b 2.0 c 3.0 |

In the output, values from the first Series (`s1`

) are preserved, and only missing values from the second Series (`s2`

) are filled in. The index of the resulting Series will be a union of the two input Series.

## What is the difference between combining and merging pandas series?

Combining and merging pandas series both involve combining data from two or more series into a single series. However, there are some differences between the two methods:

**Combining**: Combining pandas series involves concatenating the values from two or more series along a specified axis. This method does not require a common key or index to combine the series. The resulting series will have the same length as the sum of the lengths of the input series.**Merging**: Merging pandas series involves combining data from two or more series based on a common key or index. This method is typically used when you have multiple series with the same index or key and you want to combine them based on that key. The resulting series will have a length equal to the length of the input series if an inner merge is performed.

In summary, combining is a simple concatenation of series along a specified axis, while merging involves combining data from two or more series based on a common key or index.

## How to merge 2 pandas series with duplicate indexes?

If you have two pandas Series with duplicate indexes that you want to merge, you can use the `combine_first()`

method. This method will merge the two Series based on their indexes, replacing missing values from one Series with non-missing values from the other.

Here's an example:

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import pandas as pd # Create two pandas Series with duplicate indexes s1 = pd.Series([1, 2, 3], index=['a', 'b', 'c']) s2 = pd.Series([4, 5, 6], index=['b', 'c', 'd']) # Merge the two Series using combine_first() merged_series = s1.combine_first(s2) print(merged_series) |

This will output:

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a 1.0 b 2.0 c 3.0 d 6.0 dtype: float64 |

As you can see, the merged Series now includes all the indexes from both original Series, with missing values filled in with values from the other Series.