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Subsets of data can be selected by column name, index, or Boolean expressions. For example, df[df['col1'] > 5] will return all rows in the DataFrame df for which the value of the column col1 exceeds 5. [4]: 126–128 Data can be grouped together by a column value, as in df['col1'].groupby(df['col2']), or by a function which is applied to the index.
In relational algebra, a rename is a unary operation written as / where: . R is a relation; a and b are attribute names; b is an attribute of R; The result is identical to R except that the b attribute in all tuples is renamed to a. [1]
The C standard library provides a function called rename which does this action. [1] In POSIX, which is extended from the C standard, the rename function will fail if the old and new names are on different mounted file systems. [2] In SQL, renames are performed by using the CHANGE specification in ALTER TABLE statements.
Pennsylvania (/ ˌ p ɛ n s ɪ l ˈ v eɪ n i ə / ⓘ PEN-sil-VAY-nee-ə, lit. ' Penn's forest country '), officially the Commonwealth of Pennsylvania [b] (Pennsylvania Dutch: Pennsilfaani), [7] is a U.S. state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
The zero-width space can be used to mark word breaks in languages without visible space between words, such as Thai, Myanmar, Khmer, and Japanese. [ 1 ] In justified text, the rendering engine may add inter-character spacing, also known as letter spacing, between letters separated by a zero-width space, unlike around fixed-width spaces.
Thus the unit MIPS was useful to measure integer performance of any computer, including those without such a capability, and to account for architecture differences, similar MOPS (million operations per second) was used as early as 1970 [4] as well. Note that besides integer (or fixed-point) arithmetics, examples of integer operation include ...