python3 array (list) initialization
1. Initialize a fixed-length array
Sometimes it is necessary to predefine a fixed-length array and assign a value to each element
Method 1: The code in python3 is as follows:
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#coding=utf-8
item = 'PythonTab'
array = [item for v in range(10)] #把 item 的值赋给 range()迭代器的每个元素
print(array)
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result:
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['PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab']
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Method 2: The code in python3 is as follows:
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item = 'PythonTab'
array = [item]*10
print(array)
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result:
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['PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab', 'PythonTab']
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2. Initially create an array of n rows and m columns
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#coding=utf-8
n = 3
m = 3
matrix = ['init']*n
for i in range(len(matrix)):
matrix[i] = ['PY']*m #把init的值覆盖了
print(matrix)
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result:
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[['PY', 'PY', 'PY'], ['PY', 'PY', 'PY'], ['PY', 'PY', 'PY']]
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