python输出内容为拼接，或字符串中带有空格，想打印时候去掉所有空格
i = 1
while i < 4:
print(""",i,""",end="")
i += 1
# 输出内容为" 1 "," 2 "," 3 "," 4 ",
# 数字的前后都带有空格，可以使用 sep=""
print(""",i,""",sep="",end="")
# 输出的内容为"1","2","3","4",
python输出内容为拼接，或字符串中带有空格，想打印时候去掉所有空格
i = 1
while i < 4:
print(""",i,""",end="")
i += 1
# 输出内容为" 1 "," 2 "," 3 "," 4 ",
# 数字的前后都带有空格，可以使用 sep=""
print(""",i,""",sep="",end="")
# 输出的内容为"1","2","3","4",
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