[英]Why does the else statement run when my if statement is true?
這是我在while
循環中的代碼片段。 當我運行這部分代碼時,總是會打印else
語句:
for i in range(len(StudentRoster)):
if StudentRoster[i][0] == delInfo[0]:
if StudentRoster[i][1] == delInfo[1]:
del StudentRoster[i]
print(StudentRoster)
else:
print("Student is not already added to the grading manager.")
整個代碼:
def GradeManager():
StudentRoster = []
while True:
command = input("$ ")
if command[0:10] == "AddStudent":
AddInput = command[11:]
AddInput = AddInput.replace(" ", "")
StudentInfo = AddInput.split(",")
student = (StudentInfo[0], StudentInfo[1], StudentInfo[2], StudentInfo[3])
StudentRoster.append(student)
print (StudentRoster)
elif command[0:13] == "DeleteStudent":
print("yes")
delStudent = command[14:]
delStudent = delStudent.replace(" ", "")
delInfo = delStudent.split(",")
print (delInfo)
for i in range(len(StudentRoster)):
if StudentRoster[i][0] == delInfo[0]:
if StudentRoster[i][1] == delInfo[1]:
del StudentRoster[i]
print (StudentRoster)
else:
print("Student is not already added to the grading manager.")
else:
print("Fail")
GradeManager()
這是我輸入的輸入:
$ AddStudent John, Doe, 78, 94
$ AddStudent Jean, Davis, 83, 76
$ AddStudent Aaron, Johnson, 67, 72
$ DeleteStudent Aaron, Johnson
在DeleteStudent
之后,即使Aaron Johnson
在學生名單上,它也會打印出else
語句。
在for
循環迭代之一中, if StudentRoster[i][0] == delInfo[0]:
has failed
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