擅长:python、mysql、java
<p>首先,您尝试对字符串执行大于或等于数字的操作。如果要比较数字,则必须将它们转换为数字数据类型(int、float、decimal)。你知道吗</p>
<p>其次,安迪的评论也是正确的。<code>fgrade</code>还没有作为变量/对象存在。你知道吗</p>
<pre><code>fgrades=[]
a=0
b=0
c=0
d=0
f=0
grades=int(raw_input("enter your final grade: "))
fgrades += (grades,)
for i in range(len(fgrades)):
if fgrades[i]>=90:
a+=1
elif fgrades[i]>=80:
b+=1
elif fgrades[i]>=70:
c+=1
elif fgrades[i]>=60:
d+=1
else:
f+=1
print a,"\n",b,"\n",c,"\n",d,"\n",f
</code></pre>