Python实现文件读写

if scores[i] <= 0:
                    break
                #f.write(item+' '+str(label+1)+' '+str(score)+' '+str(int(box[0]))+' '+str(int(box[1]))+' '+str(int(box[2]))+' '+str(int(box[3]))+' \n')
                f.write(item+' '+str(int(labels[i])+1)+' '+str(float(scores[i]))+' '+str(boxes[i][0])+' '+str(boxes[i][1])+' '+str(boxes[i][2])+' '+str(boxes[i][3])+' \n')

实现逐行写

f = open('test.txt','w')
for i in range(5): 
    f.write('hello world!' + ',' + 'heoo 3' +'\n')
    f.write('hello world!' + ' ' + 'heoo4' +'\n')
f.close()
print('write finish!') 

实现逐行读

fp = open('test.txt', 'r')
lines = fp.readlines()
fp.close()
for i, line in enumerate(lines):
    temp = line.split(' ')
    print (temp[0])
    print (temp[1])
    #print (temp[2])

 

fp = open('test.txt', 'r')
lines = fp.readlines()
fp.close()
for i, line in enumerate(lines):
    temp = line.split(' ')
    #print (%(temp[0],temp[1])，end = ',')
    print ("sum of " + str(temp[0]) + " and " + str(temp[0]) + " is ",end= "     ") 
    #print (temp[1],end = ',')
    #print (temp[2],end = ' ')

a = 10
b = 20
c = a + b

#Normal string concatenation
print("sum of", a , "and" , b , "is" , c) 

#convert variable into str
print("sum of " + str(a) + " and " + str(b) + " is " + str(c)) 

# if you want to print in tuple way
print("Sum of %s and %s is %s: " %(a,b,c))  

#New style string formatting
print("sum of {0} and {1} is {2}".format(a,b,c)) 

#in case you want to use repr()
print("sum of " + repr(a) + " and " + repr(b) + " is " + repr(c))