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[英]Python Nested List: How to print specific elements and append to each sublist
[英]How to test which sublist contains a specific element, then print elements from that Sublist
文件名: records.csv
示例文件內容:
11, Owen, 17
4, Hank, 18
77, Paul, 10
8, Ryan, 35
12, Patrick, 24
def getFileName():
fileName = input('Input File Name: ')
return fileName
def processFile(fileName):
file = open(fileName, 'r')
lines = file.readlines()
fileList = []
info = []
pts = []
for a in lines:
fileList = a.split(',')
fileList[-1] = int(fileList[-1])
info.append(fileList)
print('-----------------------------------------------')
print('##\t Player\t Points')
print('-----------------------------------------------')
for a in info:
print(a[0],'.','\t', a[1],'\t\t', a[-1], sep='')
print('-----------------------------------------------')
for a in info:
pts.append(a[-1])
maxPts = max(pts)
# Find maxPts in one of the 5 sublist, and make a brand new list of it.
print('Top Scorer:', 'Points:', maxPts)
file.close()
def main():
fileName = getFileName()
processFile(fileName)
main()
就像上面的注釋中提到的那樣,列表“info”由子列表組成,每個子列表都包含來自“records.csv”文本文件的一行。 所以第一個子列表,例如是['11', 'Owen', 17]。 我已經從所有子列表中找到了最大“點”,在這種情況下為 35,並且希望能夠識別包含該元素的子列表,然后從所述子列表中打印元素。 任何幫助表示贊賞,謝謝。
已更新您的代碼以執行所需的操作
def getFileName():
fileName = input('Input File Name: ')
return fileName
def processFile(fileName):
file = open(fileName, 'r')
lines = file.readlines()
fileList = []
info = []
pts = []
for a in lines:
fileList = a.split(',')
fileList[-1] = int(fileList[-1])
info.append(fileList)
print('-----------------------------------------------')
print('##\t Player\t Points')
print('-----------------------------------------------')
for a in info:
print(a[0],'.','\t', a[1],'\t\t', a[-1], sep='')
print('-----------------------------------------------')
for a in info:
pts.append(a[-1])
maxPts = max(pts)
index=pts.index(maxPts) #this finds index of the element with higest score
a=info[index]
print(a[0],'.','\t', a[1],'\t\t', a[-1], sep='') #prints the list with higest score
print
# Find maxPts in one of the 5 sublist, and make a brand new list of it.
print('Top Scorer:', 'Points:', maxPts)
file.close()
def main():
fileName = getFileName()
processFile(fileName)
main()
如果您只需要一個最小值或最大值,那么對列表進行排序然后獲得您需要的值是最便宜的。
info = [
[0, "a", 121],
[1, "aa", 14],
[2, "b", 55]
]
print(sorted(info, key=lambda x:x[2])[0])
print(sorted(info, key=lambda x:x[2])[-1])
我在寫邏輯,你可以把它放到function中:
f=open('records.csv','r')
filecontent = f.readlines()
lists = [line.strip('\n').split(',') for line in filecontent if line.strip('\n')]
maxpts_sublst = max(lists,key = lambda x:int(x[-1]))
print("Top scorer: {0}, Points {1}".format(*maxpts_sublst[1:]))
f.close()
Output:
Top scorer: Ryan, Points 35
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