Term
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Definition
| In Python, [::-1] is used to reverse a sequence or string. It can be used to reverse a list of numbers, a string of characters, or any other sequence of values. When applied to a sequence, [::-1] returns a new sequence with the same values but in reverse order. |
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Term
| What does the std() method do in Pandas? |
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Definition
| The std() method is used to compute the standard deviation of a column or row. |
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Term
| What does the var() method do in Pandas? |
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Definition
| The var() method is used to compute the variance of a column or row. |
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Term
| What does the count() method do in Pandas? |
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Definition
| The count() method is used to count the number of non-null values in a column or row. |
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Term
| What does the value_counts() method do in Pandas? |
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Definition
| The value_counts() method is used to compute a frequency table of unique values in a column. |
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Term
| What does the apply() method do in Pandas? |
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Definition
| The apply() method is used to apply a function to a column or row. |
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Term
| What does the isna() method do in Pandas? |
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Definition
| The isna() method is used to check for missing or null values in a DataFrame. |
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Term
| What does the dropna() method do in Pandas? |
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Definition
| The dropna() method is used to remove missing or null values from a DataFrame. |
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Term
| What does the fillna() method do in Pandas? |
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Definition
| The fillna() method is used to fill missing or null values in a DataFrame. |
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Term
| What does the merge() method do in Pandas? |
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Definition
| The merge() method is used to combine two DataFrames based on a common column. |
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Term
| What does the pivot_table() method do in Pandas? |
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Definition
| The pivot_table() method is used to create a spreadsheet-style pivot table from a DataFrame. |
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Term
| What does the set_index() method do in Pandas? |
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Definition
| The set_index() method is used to set a column as the index of a DataFrame. |
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