- Integer division returns the floor. 7/3=2 7/-3=-3
- Complex numbers are supported but "i" turns into "j" or "J". another alternative is: complex(real,imaginary) function. z.real and z.imag are used for accessing real and imaginary parts. conversion functions such as float() int() and long() don't work for complex numbers. to get the magnitude of a complex number:abs(z)
- in interactive mode, the last printed expression is assigned to the variable _. this variable should be treated as read-only by the user. if you assign a value to it explicitly, you would create an independent local variable with the same name masking the built in variable with its magic behaviour.
- and equivalent to heredoc in php is using a pair of matching triple quotes: """ or '''.
- string concatenation: + repeat:* word="hi" '<'+word*5 + '>'
- automatic concatenation: 'hi' 'hello' = 'hihello' (can only be used for two string literals
- string indexing: word="helpA" word=A word[0:2]=He word[2:4]=lp
- python strings can not be changed by indexing. but: 'x'+word[1:]=xelpA
- And omitted first index defaults to zero. and omitted second string defaults to size of the string being sliced.
- an index that is too large is replaced by the string size.
- and upper bound smaller that the lower bound returns an empty string.
- indices may be negative numbers , to start counting from the right.
- Out-of-range negative slice indices are truncated. word[-100:]=helpA
- The indices are pointing between characters.
- length of string: len(s)
- List items need not all have the same type. a=['spam','eggs',100,1234] 3*a[:3]+['Boe!'] -> ['spam', 'eggs', 100, 'spam', 'eggs', 100, 'spam', 'eggs', 100, 'Boe!']
- len(a) to get the length of a list.
- using nested lists are also possible