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Block iterative or block conditional
As other programming language Python can manage conditional or iterative code, but it does not have special characters to identify them. Only the indent identifies a block. Two characters are allowed, the space and the tabulation. However, all the lines in a block must be indent in the same way. Because, use a tabulation is not equal to the number equivalent of spaces. Remark: a block in the interpreter must finish by an empty line. A blocks inside a Python script have not such limitation.The real examples of indentation are in the chapter while.Examples :
| Tabulation | Spaces | Mix |
| >>>def fct(A) : … [tab] print a … [tab] return a … >>> print fct(5) 5 | >>>def fct(A) : … print a … return a … >>> print fct(5) 5 | >>>def fct(A) : … [ tab] print a … return a unindent does not match any outer indentation level |
Conditions
There is the table of arithmetic or string condition to create conditional block.Non boolean conditions
| Equal | = = | Different | != |
| Lesser | < | Greater | > |
| Lesser or equal | <= | Greater or equal | >= |
| is | equal | if A is True: return True |
| in | inside | if A in ('y','yes') : return True |
while
Allow looping on a counter variable basis.Examples :
| Test 1 | Test 2 |
| >>> A=0 >>> while A<3 : … A+=1 … print A … 1 2 3 | >>> A=0 >>> while A<3 : … A+=1 … >>> print A 3 |
| Test with a line of code | Syntaxe of Test 2 in a script |
| >>> A=0 >>> while a<3: … A+=1 … >>> print A 3 | >>> A=0 >>>while A<3 : … A+=1 … >>> print A |
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