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Introduced in Python 2.2 as an optional feature and finalized in version 2.3, generators are Python's mechanism for lazy evaluation of a function that would otherwise return a space-prohibitive or computationally intensive list. This is an example to lazily generate the prime numbers:
Statement separator – demarcates the boundary between two statements; need needed for the last statement; Line continuation – escapes a newline to continue a statement on the next line; Some languages define a special character as a terminator while some, called line-oriented, rely on the newline.
Semicolons are optional in a number of languages, including BCPL, [41] Python, [42] R, [43] Eiffel, [44] and Go, [45] meaning that they are part of the formal grammar for the language but can be inferred in many or all contexts (e.g., by end of line that ends a statement, as in Go and R). As languages can be designed without them, semicolons ...
In general, digits should be grouped and separated either by commas or by narrow gaps (never a period/full point). Grouping with commas Left of the decimal point, five or more digits are grouped into threes separated by commas (e.g. 12,200; 255,200 km; 8,274,527th; 1 ⁄ 86,400). Numbers with exactly four digits left of the decimal point may ...
Set of expression parsing rules (called grammar) is as follows, Rule1: E → E + E: Expression is the sum of two expressions. Rule2: E → E * E: Expression is the product of two expressions. Rule3: E → number: Expression is a simple number Rule4: + has less precedence than *
For example, a grammar for a context-free language is left-recursive if there exists a non-terminal symbol A that can be put through the production rules to produce a string with A as the leftmost symbol. [15] An example of recursive grammar is a clause within a sentence separated by two commas. [16]
In this sentence, furthermore, commas would also be called for. This sentence is a bit different; however, a comma is necessary as well. Using commas to offset certain adverbs is optional, including then, so, yet, instead, and too (meaning also). So, that's it for this rule. or; So that's it for this rule. A comma would be appropriate in this ...
In many contexts, when a number is spoken, the function of the separator is assumed by the spoken name of the symbol: comma or point in most cases. [6] [2] [7] In some specialized contexts, the word decimal is instead used for this purpose (such as in International Civil Aviation Organization-regulated air traffic control communications).