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x x x x x x
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< y > y == y != y >= y <= y
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Description
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Less than Greater than Equal to Not equal to Greater than or equal to Less than or equal to
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Comparisons can be chained together, such as in w < x < y < z Such expressions are evaluated as w < x and x < y and y < z Expressions such as x < y > z are legal but are likely to confuse anyone reading the code (it s important to note that no comparison is made between x and z in such an expression) Comparisons involving complex numbers are undefined and result in a TypeError Operations involving numbers are valid only if the operands are of the same type For built-in numbers, a coercion operation is performed to convert one of the types to the other, as follows: 1 If either operand is a complex number, the other operand is converted to a complex number
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Operations on Sequences
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2 If either operand is a floating-point number, the other is converted to a float 3 Otherwise, both numbers must be integers and no conversion is performed For user-defined objects, the behavior of expressions involving mixed operands depends on the implementation of the object As a general rule, the interpreter does not try to perform any kind of implicit type conversion
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The following operators can be applied to sequence types, including strings, lists, and tuples:
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s + r s * n, n * s v1,v2 , vn = s s[i] s[i:j] s[i:j:stride] x in s, x not in s for x in s: all(s) any(s) len(s) min(s) max(s) sum(s [, initial])
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Concatenation Makes n copies of s, where n is an integer Variable unpacking Indexing Slicing Extended slicing Membership Iteration Returns True if all items in s are true Returns True if any item in s is true Length Minimum item in s Maximum item in s Sum of items with an optional initial value
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The + operator concatenates two sequences of the same typeThe s * n operator makes n copies of a sequence However, these are shallow copies that replicate elements by reference only For example, consider the following code:
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>>> a = [3,4,5] >>> b = [a] >>> c = 4*b >>> c [[3, 4, 5], [3, 4, 5], [3, 4, 5], [3, 4, 5]] >>> a[0] = -7 >>> c [[-7, 4, 5], [-7, 4, 5], [-7, 4, 5], [-7, 4, 5]] >>>
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Notice how the change to a modified every element of the list c In this case, a reference to the list a was placed in the list bWhen b was replicated, four additional references to a were created Finally, when a was modified, this change was propagated to all the other copies of aThis behavior of sequence multiplication is often unexpected and not the intent of the programmer One way to work around the problem is to manually construct the replicated sequence by duplicating the contents of a Here s an example:
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a = [ 3, 4, 5 ] c = [list(a) for j in range(4)] # list() makes a copy of a list
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The copy module in the standard library can also be used to make copies of objects
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4 Operators and Expressions
All sequences can be unpacked into a sequence of variable names For example:
items = [ 3, 4, 5 ] x,y,z = items # x = 3, y = 4, z = 5 letters = "abc" x,y,z = letters
# x = 'a', y = 'b', z = 'c'
datetime = ((5, 19, 2008), (10, 30, "am")) (month,day,year),(hour,minute,am_pm) = datetime
When unpacking values into variables, the number of variables must exactly match the number of items in the sequence In addition, the structure of the variables must match that of the sequence For example, the last line of the example unpacks values into six variables, organized into two 3-tuples, which is the structure of the sequence on the right Unpacking sequences into variables works with any kind of sequence, including those created by iterators and generators The indexing operator s[n] returns the nth object from a sequence in which s[0] is the first object Negative indices can be used to fetch characters from the end of a sequence For example, s[-1] returns the last item Otherwise, attempts to access elements that are out of range result in an IndexError exception The slicing operator s[i:j] extracts a subsequence from s consisting of the elements with index k, where i <= k < j Both i and j must be integers or long integers If the starting or ending index is omitted, the beginning or end of the sequence is assumed, respectively Negative indices are allowed and assumed to be relative to the end of the sequence If i or j is out of range, they re assumed to refer to the beginning or end of a sequence, depending on whether their value refers to an element before the first item or after the last item, respectively The slicing operator may be given an optional stride, s[i:j:stride], that causes the slice to skip elements However, the behavior is somewhat more subtle If a stride is supplied, i is the starting index; j is the ending index; and the produced subsequence is the elements s[i], s[i+stride], s[i+2*stride], and so forth until index j is reached (which is not included)The stride may also be negative If the starting index i is omitted, it is set to the beginning of the sequence if stride is positive or the end of the sequence if stride is negative If the ending index j is omitted, it is set to the end of the sequence if stride is positive or the beginning of the sequence if stride is negative Here are some examples:
a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] b c d e f g h i j = = = = = = = = = a[::2] a[::-2] a[0:5:2] a[5:0:-2] a[:5:1] a[:5:-1] a[5::1] a[5::-1] a[5:0:-1] # # # # # # # # # b c d e f g h i j = = = = = = = = = [0, 2, 4, 6, 8 ] [9, 7, 5, 3, 1 ] [0,2] [5,3,1] [0,1,2,3,4] [9,8,7,6] [5,6,7,8,9] [5,4,3,2,1,0] [5,4,3,2,1]
The x in s operator tests to see whether the object x is in the sequence s and returns True or False Similarly, the x not in s operator tests whether x is not in the sequence s For strings, the in and not in operators accept subtrings For example,