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Pandas' syntax for mapping index values to relevant data is the same syntax Python uses to map dictionary keys to values. For example, if s is a Series, s['a'] will return the data point at index a. Unlike dictionary keys, index values are not guaranteed to be unique.
In the phone book example with a composite index created on the columns (city, last_name, first_name), if we search by giving exact values for all the three fields, search time is minimal—but if we provide the values for city and first_name only, the search uses only the city field to retrieve all matched records.
In Python, == compares by value. Python's is operator may be used to compare object identities (comparison by reference), and comparisons may be chained—for example, a <= b <= c. Python uses and, or, and not as Boolean operators. Python has a type of expression named a list comprehension, and a more general expression named a generator ...
For example, the Odin article links to a list of names of Odin, which include kennings. A few examples of Odin's kennings are given here. A few examples of Odin's kennings are given here. For a scholarly list of kennings see Meissner's Die Kenningar der Skalden (1921) or some editions of Snorri Sturluson 's Skáldskaparmál .
This is a list of government-owned companies of Ethiopia. A Government-owned corporation is a legal entity that undertakes commercial activities on behalf of an owner government . There is no standard definition of a government-owned corporation (GOC) or state-owned enterprise (SOE), although the two terms can be used interchangeably.
89 (Caers - Cross) gynecomastia, correct? THE COURT: Do you need a hard copy? Why don't you give him a hard copy. ANo, no, that's --QI can shorten this up, Your Honor.
A dictionary is a map of a list of keys to a list of values. A table is a transposed dictionary of symbol keys and equal length lists (columns) as values. A keyed table, analogous to a table with a primary key placed on it, is a dictionary where the keys and values are arranged as two tables.
A list of cinder cones is shown below. This list is incomplete; you can help by adding missing items. (February 2011) Africa. Democratic Republic of the Congo