About running a Python program performance, what tools can improve performance?
1, for the performance of a large part of the code may be written in C or C ++
2, the performance impact caused by obstruction IO, IO can be used to address a multiplexer
3, to make use of the built-in function python
4, to make use of local variable
python unsupported data types
A. char
B. int
C. a float
D. List
A
Option is selected for the correct expression of the expression
A. {. 1: 0,2: 0,3: 0}
B. { '. 1': 0, '2': 0, '. 3': 0}
C. {(. 1 , 2): 0, (4,3-): 0}
D. {[1,2]: 0, [4,3-]: 0}
E. {{1,2}: 0, 4,3- {}: 0}
ABC correct
A: {. 1: 0, 2: 0,. 3: 0}
B: { '. 1': 0, '2': 0, '. 3': 0}
C: {(. 1, 2): 0, (4, 3): 0}