python檔案讀寫操作

標籤：

代碼：

[email protected]:/study/python# cat write.py #!/usr/bin/pythonoutput_file = open("test.txt","w")output_file.write("write test\n")output_file.close()output_file = open("test.txt","a")output_file.write("write test\n")output_file.close()def sum(input_file, output_file):for line in input_file:operands = line.split()print 'operands', operandssum = float(operands[0]) + float(operands[1])new_line = line.rstrip() + ' ' + str(sum) + '\n'output_file.write(new_line)returnif __name__ == "__main__":infile = open("data_in.txt","r")outfile = open("data_out.txt","w")sum(infile, outfile)infile.close()outfile.close()

輸入檔案的內容：

[email protected]:/study/python# cat data_in.txt 
111 222
111 333
222 222
222 444

執行過程：

[email protected]:/study/python# ./write.py 
operands [‘111‘, ‘222‘]
operands [‘111‘, ‘333‘]
operands [‘222‘, ‘222‘]
operands [‘222‘, ‘444‘]
[email protected]:/study/python# 

執行後，輸出檔案的結果：

[email protected]:/study/python# cat data_out.txt 
111 222 333.0
111 333 444.0
222 222 444.0
222 444 666.0
[email protected]:/study/python# 

python檔案讀寫操作