Get concise summary of DataFrame
Fill NaN values with a specified value
Find unique values in a Series
Count occurrences of each unique value
df["col"].value_counts
Series.value_counts() counts the frequency of unique values.
Frequency of values
df["col"].value_counts()
Relative frequency of values
df["col"].value_counts(normalize=True)
Read a CSV file into a DataFrame
View the first few rows of a DataFrame
Generate descriptive statistics of numeric columns