有以下幾種方法可以優化代碼中使用str的方式：
name = "Alice"
age = 30
# 普通字符串拼接
message = "My name is " + name + " and I am " + str(age) + " years old."
# 使用f-string
message = f"My name is {name} and I am {age} years old."
name = "Alice"
age = 30
# 使用str.format()方法
message = "My name is {} and I am {} years old.".format(name, age)
names = ["Alice", "Bob", "Charlie"]
# 普通字符串拼接
message = ""
for name in names:
message += name + " "
# 使用join()方法
message = " ".join(names)
num = 10
# 普通字符串拼接
message = "The number is " + str(num)
# 使用str()函數
message = "The number is " + str(num)
通過以上方法，可以提高代碼的可讀性和性能。
