学习python文件（转载）

这是在中国大学MOOC上学习的，为了防止自己忘记了，在此记录一下。

打开文件

def main():    fname = "E:\project\File\\v932f1.json"    infile = open(fname, "r")    data = infile.read()    print(data)main()

复制文件里面的内容到另一个文件中

def main():    f1 = "v932f1.json"    f2 = "new.json"    infile = open(f1, "r")    outfile = open(f2, "w")    countLines = countChars = 0    for line in infile:        countLines +=1 #行数        countChars+=len(line) #一行有多少列        outfile.write(line)    print(countLines, "Lines and", countChars, "char copied")    infile.close()    outfile.close()if __name__ == '__main__':    main()

读取文件里面的值来画图形`据数据文件在窗口中动态路径绘制

300,0,144,1,0,0300,0,144,0,1,0300,0,144,0,0,1300,0,144,1,1,0300,0,108,0,1,1184,0,72,1,0,1184,0,72,0,0,0184,0,72,0,0,0184,0,72,0,0,0184,1,72,1,0,1184,1,72,0,0,0184,1,72,0,0,0184,1,72,0,0,0184,1,72,0,0,0184,1,720,0,0,0 import turtledef main():    # 设置窗口信息    #turtle坐标原点默认设置在窗口中心    turtle.title('数据驱动的动态路径绘制')    turtle.setup(800, 600, 0, 0)    # 设置画笔    pen = turtle.Turtle()    pen.color("red")    pen.width(5)  #粗细程度    pen.shape("turtle")    pen.speed(5) #绘制速度    # 读取文件    result = []    file = open("data.txt", "r")    for line in file:        result.append(list(map(float, line.split(','))))#将文件中每行数据存储在result中        #line.split(',') 按逗号分隔成数组        #将参数二进行参数一操作（把数组里面的str转为float）        #把结果导为list        #把新生成的list加在result后面    print(result)    # 动态绘制    for i in range(len(result)):        pen.color((result[i][3], result[i][4], result[i][5]))        pen.forward(result[i][0])        if result[i][1]:            pen.rt(result[i][2])        else:            pen.lt(result[i][2])    pen.goto(0, 0)#画笔定位为窗口的原点if __name__ == '__main__':    main()