Question

您好，我有以下代码：

login=os.getlogin()
if not os.path.exist("C:\Users\login\Documents")

如您所见，我有一个登录变量来获取计算机的用户，但是我正在努力在“ if not os.path.exist”语句中使用它，我想要的输出是让python获取用户的用户名，并在目录中使用它。

谢谢！

Answer 1

您可以使用字符串格式：

import cv2
import numpy as np

winName = "ForeGround Segment"

def foreground_segment(im, brightness, useEqualize=1, blurSize=21, th1=None):
    winName = "ForeGround Segment"
    tmp = brightness

    if (blurSize >= 3):
        blurSize += (1 - blurSize % 2)
        tmp = cv2.GaussianBlur(tmp, (blurSize, blurSize), 0)
    if (useEqualize):
        tmp = cv2.equalizeHist(tmp)

    cv2.imshow('brightness preprocess', tmp)
    #cv2.imwrite('../BrightnessPreprocess.png', tmp)

    ret, tmp = cv2.threshold(tmp, th1, 255, cv2.THRESH_BINARY_INV)
    cv2.imshow('threshold', tmp)

    im2, contours, hierarchy = cv2.findContours(tmp, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    dst = im.copy()

    #print(contours)    

    maxDim = 0
    largest = -1
    for i in range(len(contours)):
        cv2.drawContours(dst, contours, largest, (0, 0, 255), 1)
        dim = len(contours[i])
        if (dim > maxDim):
            maxDim = dim
            largest = i

    img_mask = np.zeros(src.shape, np.uint8)

    if (largest >= 0):
        theImg = contours[largest]
        cv2.polylines(dst, theImg, True, (0, 255,0), 2)
        cv2.drawContours(img_mask, contours, largest, 255, -1)

    cv2.imshow("Result Mask", img_mask)
    cv2.imshow("Result Contour", dst)
    #cv2.imwrite("../img_mask.png", img_mask)
    #cv2.imwrite("../result.png", dst)

if __name__ == '__main__':
    src = cv2.imread('frontal.png')
    src = cv2.resize(src, (int(src.shape[0]/3), int(src.shape[1]/3)), interpolation = cv2.INTER_AREA)
    cv2.imshow(winName, src)
    dst = cv2.cvtColor(src, cv2.COLOR_BGR2HSV)
    hsv_planes = cv2.split(dst)
    brightness = hsv_planes[2]
    useEqualize = 1
    blurSize = 21
    th1 = int(33.0 * 255 / 100)
    cv2.createTrackbar("Equalize", winName, useEqualize, 1, foreground_segment)
    cv2.createTrackbar("Blur Sigma", winName, blurSize, 100, foreground_segment)
    cv2.createTrackbar("Threshold", winName, th1, 255, foreground_segment)

    while(1):

        #--- Using cv2.getTrackbarPos() to get values from the slider ---
        useEqualize = cv2.getTrackbarPos('Equalize', winName)
        blurSize = cv2.getTrackbarPos('Blur Sigma', winName)
        th1 = cv2.getTrackbarPos('Threshold', winName)

        foreground_segment(src, brightness, useEqualize, blurSize, th1)

        #--- Press Q to quit ---            
        k = cv2.waitKey(1) & 0xFF
        if k == 27:
            break

    cv2.destroyAllWindows()

或者您可以自己构建字符串：

if not os.path.exists("C:\Users\{0}\Documents".format(login)):

或者如果使用join：

if not os.path.exists("C:\Users\\" + login + "\Documents"):

正如评论所指出的，您还应该查看 question。这显示了如何正确获取登录名名称。

如何在python中将变量添加到目录

1 个答案: